These brand new stock-style Triumph 650 c.c. which have the 1-3/4" flared end to fit over your exhaust spigots and are 1-1/2" OD the rest of the length. These have the tab on each pipe to use the stock type exhaust brackets for easy mounting. Beautiful chrome, these will accept any mufflers for 1-1/2" exhaust pipes.These will fit Triumph 650cc motors 1963-1970. Keep in mind the primary side pipe is lower than the kicker side, just like the stock header pipes. Replacement for OEM # 70-5957, 70-5958