New Top Quality Triumph Tachometer Gearbox / Gear Change Quadrant O-Ring Set. Each O-Ring measures 9/16″ O.D. and are sold in pairs as pictured! Fits many Triumph 350, 500, 650 & 750 Twins. Also can be used for “Universal” purposes for applications that would require this size O-Ring.! Please refer to your parts manual for proper fitment.*****Always check your parts book to ensure that this Part is correct for your application!*****Made in EnglandO.E.M Part number is 70-3309, 60-3530 or E3309