*Back In Stock!* New Top Quality Triumph & BSA Twins Mainshaft “High Gear” Oil Seal. As we always say here at C.B.S., don’t settle for Cheap & Low Quality Oil Seals! Do your Rebuild the Correct way… the First Time! Fits Triumph Pre-Unit & Unit Twins both 500 & 650 (Bonneville, T120, T110, 6T, Thunderbird, Tiger, TR6, Etc) from 1947-1972 Equipped with the “4 Speed” Transmission. Also fits all BSA A50 & A65 Unit Twins (Lightning, Thunderbolt, Royal Star, Firebird, Cyclone, Spitfire, Rocket, Etc) from 1962-1972. Please refer to your parts catalog for proper fitment.*****Please note that this Oil Seal will not work on Triumph Models equipped with the “5 Speed” Gear Box! Not Compatible with 350 & 500 Unit Triumph Twins from 1957-1974.*****Made in TaiwanO.E.M Part number is 57-0946, T0946 or 68-0027