Replacement Wrist Pin and Circlips for our 52mm TBW0190 and TBW0365 pistons. If you aren’t sure what piston you have, please email a picture to [email protected] and mention what year and model engine the piston was in and if a stroker crank was used in the engine – the more details on the type of engine and modifications such as race head being used or not etc will help us determine which piston you have.