These are stock replacement two-valve oil pumps for unit 500, 650 amnd 750cc Triumph motorcycles, 1963 & up. T120 and T140 Bonneville, TR6 and TR7 Tiger, et cetera. Replaces stock part 70-9421. Why trust your entire motor to a cheap, poorly made oil pump? These are made in the UK and are top-quality. You can't get much more important than your oil pump, about 20 seconds after your pump fails at highway speeds you are going to throw a rod, and then you are FUBAR. This is a direct replacement for OEM # 70-9421.