Royal Enfield 521112/B Side Panel & Magneto Cable Grommet – Interceptor 650, Continental GT 650, Thunderbird 350/500, Classic 500 & TBTS Models – Genuine OEM Rubber

The Royal Enfield 521112/B Grommet is a small but critical OEM rubber part used across multiple Royal Enfield models to cushion and locate side panels and protect wiring/cables. Official Thunderbird 350/500 parts catalogues list 521112/B as the side panel grommet used in sets of four on both panels, ensuring a snug, rattle-free fit. Classic 500 Euro IV (BS4 EFI) microfiche also shows the same grommet on the left-hand side panel bracket, confirming its use on late-model C5 bikes.

SET OF 4 PCS

On the 650 Twins, multiple OEM dealers catalogue 521112/B as “Grommet, Side Panel – INT650” and “Interceptor/GT 650 side panel grommet”, used to mount the side covers securely on the Interceptor 650 and Continental GT 650. Several export parts sites and retired-model catalogues further confirm 521112/B as the standard “GROMMET T1” shared with older Thunderbird platforms.

This genuine Royal Enfield rubber grommet helps eliminate vibration noise, prevents plastic side covers from chipping the frame, and protects any passing cables or harness from sharp metal edges. Ideal when your side panels feel loose, rattle over bad roads, or fall off due to worn-out rubbers. Being OEM, it matches factory dimensions and rubber hardness, making it a direct fit with no modification.

If you are restoring or maintaining a Thunderbird, Classic 500 or 650 Twin the right way, replacing tired grommets with fresh 521112/B pieces is a low-cost upgrade that immediately improves fit, finish and reliability.

Key Features 

• Genuine Royal Enfield OEM grommet – Part No. 521112/B (often shortened to 521112 in price lists).

• Used as side panel mounting grommet on Thunderbird 350/500 UCE models (TBTS) – 4 pieces per bike in the panel assembly.

• Confirmed in Classic 500 Euro IV (BS4 EFI) microfiche as LH side panel bracket grommet.

• Listed by multiple official dealers as “Grommet, Side Panel – INT650” for Interceptor 650 & Continental GT 650 twins.

• Helps stop panel rattles and squeaks, especially on rough Indian road conditions.

• Protects paint and frame by providing a soft rubber cushion between metal panel tabs and frame lugs.

• Also suitable where used as magneto / wiring cable grommet in certain older Thunderbird/Bullet applications (as per OEM & export listings – see note).

• Direct replacement with factory-correct size, rubber hardness and groove profile – no cutting or modification required.

• Supplied as 4 pcs  (4N) so you can order exactly as many as needed for your bike or restoration project.

Compatibility Table

(Only models with confirmed catalogue / dealer evidence are listed.)

*For legacy CI/AVL Bullet, Machismo, Lightning, Thunderbird etc., please cross-check with your frame/engine number or local RE dealer.

If your motorcycle is not listed above, please treat fitment as unconfirmed and verify via VIN + microfiche before ordering.

Variants

• Single SKU / Single Variant

  • Part Number: 521112/B (may also appear as 521112 in some price lists)

  • Pack Size: 4 piece (for replacing full side panel set on TBTS/Classic/GT/INT)

(No LH/RH/colour variants – this is a universal rubber grommet where specified by RE.)

FAQs 

Q1. How many 521112/B grommets does my bike need?
Thunderbird 350/500 and many Classic 500 / 650 Twin applications typically use 4 pieces for the side panels (two per panel). Always refer to your microfiche or workshop manual to confirm the exact quantity for your variant.

Q2. Will this fit my Interceptor 650 or Continental GT 650?
Yes. Multiple official dealers list 521112/B specifically as “Grommet, Side Panel – INT650 / GT650”, used to mount the side covers on both twins.

Q3. Is this grommet used only for side panels or also for cables?
On newer UCE and 650 models it is mainly used as a side panel mounting grommet. Some legacy Bullet/Thunderbird applications also use 521112/B as a magneto/wiring cable grommet, as indicated by export listings.

Q4. Is this a genuine Royal Enfield spare or aftermarket?
This listing is for a genuine Royal Enfield OEM grommet, matching the part supplied from the factory when the motorcycle was new.

Q5. What are the signs that my grommets need replacement?
Loose or rattling side panels, covers that fall off easily, or visibly cracked/flattened rubber around panel lugs are clear signs that your original grommets have hardened and should be replaced.