NOS factory BSA exhaust pipe to fit B31 model singles. May fit other models but check your exhaust port inside diameter. The outside diameter on this pipe is 1 5/8" Part# 65-2687. Fits both the rigid and plunger frame models. Still has original factory wrapping on it. Pipe is MINT. Perfect for that factory correct 100 point restoration when it has to be right. We all know that the reproduction pipes are not the same as original. Pipe sat on a shelf for the last 60 years! Keep in mind that this will ship in large box and shippers go by size as well as weight. If you need a quote contact me as Ebay does not get shipping rates right