*New!* Top Quality Triumph & BSA 5 Speed Gearbox Sprocket O-Ring Seal. If your rebuilding your Gearbox we always recommended installing a New O-Ring Seal! Keep Oil in your Transmission where it belongs! Installs right in front of the Locking Tab washer! Can also be used on the Oil Filter Cap for T150’s! Fits all Triumph & BSA Twins & Triples with the “5 Speed Gearbox” (Bonneville, T140, T120RV, T150V, Tiger TR6RV, A75, Rocket III, Etc) from 1971-1982. Please refer to your parts catalog for proper fitment.*****Always check your parts book to ensure the Best Fitment! May fit other models that are not listed abouve!*****Made in EnglandO.E.M Part number is 71-1070