{"product_id":"royal-enfield-521092d-lid-air-filter-thunderbird-350-uce","title":"521092\/D – Lid, Air Filter (Airbox Top Cover) for Thunderbird 350 UCE (TBTS BS3 \u0026 BS4\/ABS “NTB 350”) – Genuine Royal Enfield","description":"\u003cp data-start=\"257\" data-end=\"813\"\u003eRestore a dust-tight seal on your Thunderbird’s intake with the genuine \u003cstrong data-start=\"329\" data-end=\"373\"\u003eRoyal Enfield 521092\/D – Lid, Air Filter\u003c\/strong\u003e. This is the \u003cstrong data-start=\"387\" data-end=\"407\"\u003eairbox top cover\u003c\/strong\u003e that clamps the filter element inside the OE air cleaner housing on \u003cstrong data-start=\"476\" data-end=\"499\"\u003eThunderbird 350 UCE\u003c\/strong\u003e models (listed in fiches as \u003cstrong data-start=\"528\" data-end=\"536\"\u003eTBTS\u003c\/strong\u003e and \u003cstrong data-start=\"541\" data-end=\"562\"\u003eBS4\/ABS “NTB 350”\u003c\/strong\u003e). Because it’s OEM, the \u003cstrong data-start=\"587\" data-end=\"650\"\u003elip profile, latch\/fastener locations and moulded seal land\u003c\/strong\u003e match factory spec, so it seats flat on the \u003cstrong data-start=\"695\" data-end=\"714\"\u003eAir Filter Body\u003c\/strong\u003e and prevents dust or water from bypassing the element—something universal lids cannot guarantee.\u003c\/p\u003e\n\u003cp data-start=\"815\" data-end=\"1301\"\u003eUse this part when your existing lid is \u003cstrong data-start=\"855\" data-end=\"941\"\u003ewarped, cracked, missing clips\/screws, or not sealing after a fall\/over-tightening\u003c\/strong\u003e. Pair it with a fresh \u003cstrong data-start=\"964\" data-end=\"982\"\u003efilter element\u003c\/strong\u003e and check the snorkel and drain for a like-new intake. We verified the official name and supersession as \u003cstrong data-start=\"1088\" data-end=\"1120\"\u003e“LID, AIR FILTER – 521092\/D”\u003c\/strong\u003e, with dealer pages mapping it specifically to \u003cstrong data-start=\"1167\" data-end=\"1203\"\u003eThunderbird 350 (TBTS \/ NTB 350)\u003c\/strong\u003e. To minimize returns, we list only confirmed fitment below. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch1 data-start=\"1303\" data-end=\"1317\"\u003eKey Features\u003c\/h1\u003e\n\u003cul data-start=\"1318\" data-end=\"1794\"\u003e\n\u003cli data-start=\"1318\" data-end=\"1434\"\u003e\n\u003cp data-start=\"1320\" data-end=\"1434\"\u003e\u003cstrong data-start=\"1320\" data-end=\"1335\"\u003eGenuine OEM\u003c\/strong\u003e \u003cstrong data-start=\"1336\" data-end=\"1355\"\u003eLid, Air Filter\u003c\/strong\u003e – \u003cstrong data-start=\"1358\" data-end=\"1375\"\u003ePart 521092\/D\u003c\/strong\u003e (replaces 521092). \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1435\" data-end=\"1543\"\u003e\n\u003cp data-start=\"1437\" data-end=\"1543\"\u003eCorrect OE \u003cstrong data-start=\"1448\" data-end=\"1479\"\u003eseal land \u0026amp; mounting points\u003c\/strong\u003e for dust-tight closure. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1544\" data-end=\"1606\"\u003e\n\u003cp data-start=\"1546\" data-end=\"1606\"\u003e\u003cstrong data-start=\"1546\" data-end=\"1563\"\u003ePlug-and-play\u003c\/strong\u003e on stock airbox—no drilling or trimming.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1607\" data-end=\"1671\"\u003e\n\u003cp data-start=\"1609\" data-end=\"1671\"\u003eRestores proper filtration and intake noise characteristics.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1672\" data-end=\"1743\"\u003e\n\u003cp data-start=\"1674\" data-end=\"1743\"\u003eIdeal fix for lids that are \u003cstrong data-start=\"1702\" data-end=\"1720\"\u003ewarped\/cracked\u003c\/strong\u003e or missing hardware.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1744\" data-end=\"1794\"\u003e\n\u003cp data-start=\"1746\" data-end=\"1794\"\u003eShips in OE-labelled packaging with GST invoice.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch1 data-start=\"1796\" data-end=\"1834\"\u003eCompatibility Table\u003c\/h1\u003e\n\u003cdiv class=\"_tableContainer_1rjym_1\"\u003e\n\u003cdiv class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\n\u003ctable data-start=\"1836\" data-end=\"2210\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead data-start=\"1836\" data-end=\"1892\"\u003e\n\u003ctr data-start=\"1836\" data-end=\"1892\"\u003e\n\u003cth data-start=\"1836\" data-end=\"1844\" data-col-size=\"sm\"\u003eModel\u003c\/th\u003e\n\u003cth data-start=\"1844\" data-end=\"1864\" data-col-size=\"sm\"\u003eEngine \/ Platform\u003c\/th\u003e\n\u003cth data-start=\"1864\" data-end=\"1883\" data-col-size=\"sm\"\u003eBS Stage \/ Years\u003c\/th\u003e\n\u003cth data-start=\"1883\" data-end=\"1892\" data-col-size=\"md\"\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"1911\" data-end=\"2210\"\u003e\n\u003ctr data-start=\"1911\" data-end=\"2055\"\u003e\n\u003ctd data-start=\"1911\" data-end=\"1940\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1913\" data-end=\"1939\"\u003eThunderbird 350 (TBTS)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"1940\" data-end=\"1953\" data-col-size=\"sm\"\u003e346 cc UCE\u003c\/td\u003e\n\u003ctd data-start=\"1953\" data-end=\"1976\" data-col-size=\"sm\"\u003e\n\u003cstrong data-start=\"1955\" data-end=\"1962\"\u003eBS3\u003c\/strong\u003e (~2009–2012)\u003c\/td\u003e\n\u003ctd data-start=\"1976\" data-end=\"2055\" data-col-size=\"md\"\u003eListed as \u003cem data-start=\"1988\" data-end=\"2005\"\u003eLID, AIR FILTER\u003c\/em\u003e 521092\/D. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2056\" data-end=\"2210\"\u003e\n\u003ctd data-start=\"2056\" data-end=\"2096\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"2058\" data-end=\"2095\"\u003eThunderbird 350 (ABS \/ “NTB 350”)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"2096\" data-end=\"2109\" data-col-size=\"sm\"\u003e346 cc UCE\u003c\/td\u003e\n\u003ctd data-start=\"2109\" data-end=\"2132\" data-col-size=\"sm\"\u003e\n\u003cstrong data-start=\"2111\" data-end=\"2118\"\u003eBS4\u003c\/strong\u003e (~2017–2020)\u003c\/td\u003e\n\u003ctd data-start=\"2132\" data-end=\"2210\" data-col-size=\"md\"\u003eDealer mapping to NTB 350 (ABS BS4).\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cblockquote data-start=\"2212\" data-end=\"2421\"\u003e\n\u003cp data-start=\"2214\" data-end=\"2421\"\u003e\u003cstrong data-start=\"2214\" data-end=\"2243\"\u003eNot confirmed \/ excluded:\u003c\/strong\u003e Thunderbird 500, Classic\/Bullet\/Electra UCE, J-Series (Classic Reborn\/Bullet 350 J\/Meteor), Himalayan\/Scram, Twins 650. Order only for \u003cstrong data-start=\"2379\" data-end=\"2389\"\u003eTB 350\u003c\/strong\u003e unless we VIN-verify otherwise.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003ch1 data-start=\"2423\" data-end=\"2460\"\u003eVariants \/ Related \u003c\/h1\u003e\n\u003cul data-start=\"2461\" data-end=\"2701\"\u003e\n\u003cli data-start=\"2461\" data-end=\"2701\"\u003e\n\u003cp data-start=\"2463\" data-end=\"2701\"\u003e\u003cstrong data-start=\"2463\" data-end=\"2514\"\u003e521091\/D – Air Filter Body (airbox lower shell)\u003c\/strong\u003e; \u003cstrong data-start=\"2516\" data-end=\"2552\"\u003e521093\/D – Cover, Filter Element\u003c\/strong\u003e (front service cover); \u003cstrong data-start=\"2576\" data-end=\"2598\"\u003e521094\/A – Beading\u003c\/strong\u003e (seal). These appear alongside 521092\/D in the same fiche block.\u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch1 data-start=\"2703\" data-end=\"2709\"\u003eFAQs\u003c\/h1\u003e\n\u003cp data-start=\"2710\" data-end=\"2880\"\u003e\u003cstrong data-start=\"2710\" data-end=\"2759\"\u003eQ1. Is this the complete air filter assembly?\u003c\/strong\u003e\u003cbr data-start=\"2759\" data-end=\"2762\"\u003eNo—this is the \u003cstrong data-start=\"2777\" data-end=\"2796\"\u003elid (top cover)\u003c\/strong\u003e only. For the full unit, order the \u003cem data-start=\"2832\" data-end=\"2853\"\u003eAir Filter Assembly\u003c\/em\u003e specific to your TB 350.\u003c\/p\u003e\n\u003cp data-start=\"2882\" data-end=\"3031\"\u003e\u003cstrong data-start=\"2882\" data-end=\"2926\"\u003eQ2. Will it fit Thunderbird 350 BS4 ABS?\u003c\/strong\u003e\u003cbr data-start=\"2926\" data-end=\"2929\"\u003eYes—dealer listings show \u003cstrong data-start=\"2954\" data-end=\"2966\"\u003e521092\/D\u003c\/strong\u003e for \u003cstrong data-start=\"2971\" data-end=\"2992\"\u003eNTB 350 (ABS\/BS4)\u003c\/strong\u003e. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"3033\" data-end=\"3213\"\u003e\u003cstrong data-start=\"3033\" data-end=\"3072\"\u003eQ3. Do I need a new seal or screws?\u003c\/strong\u003e\u003cbr data-start=\"3072\" data-end=\"3075\"\u003eRe-use good hardware if undamaged. If the beading\/seal is flattened or torn, replace (\u003cstrong data-start=\"3161\" data-end=\"3173\"\u003e521094\/A\u003c\/strong\u003e). \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"3215\" data-end=\"3333\"\u003e\u003cstrong data-start=\"3215\" data-end=\"3251\"\u003eQ4. How do I confirm for my VIN?\u003c\/strong\u003e\u003cbr data-start=\"3251\" data-end=\"3254\"\u003eShare your \u003cstrong data-start=\"3265\" data-end=\"3272\"\u003eVIN\u003c\/strong\u003e; we’ll fiche-check the exact airbox variant before dispatch.\u003c\/p\u003e","brand":"UNDER THE HOOD","offers":[{"title":"Default Title","offer_id":50624264143143,"sku":null,"price":118.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/Royal_Enfield_air_filter_lid_521092D_TBTS_NTB_350.png?v=1762282141","url":"https:\/\/underthehood.co.in\/products\/royal-enfield-521092d-lid-air-filter-thunderbird-350-uce","provider":"UNDER THE HOOD","version":"1.0","type":"link"}