New Top Quality Triumph Unit Twins Crankshaft Drive Side 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 all Triumph 350 & 500 Unit Twins (Daytona, T100, T100T, T100R, T90, 3TA, 5TA, T100C, Etc) models up to 1970. Also fits all Triumph 650 Unit Twins (Bonneville, Tiger, Trophy, TR6, TR6C & T120) models from 1963-1968 only. Please refer to your parts catalog for proper fitment.*****Please note that this Oil Seal is not Compatible with Triumph “Pre-Unit” Twins! Late Triumph 500 & 650 Twins (1971 & On) do not use this Seal! Check your parts book!*****Made in TaiwanO.E.M Part number is 70-3876 or E3876