The pushrod on my pedal is 4". That has a rounded tip on it that depressed a MC piston with just a dimple on the end of the piston. The piston on the new MC has a 1/2"bore in the end of the piston 1 1/4" deep. The pushrod will catch the new piston, but does not seem like the right fit. The dimple sits inside the 1/2" hole and the flare around it catches the OD of the 1/2' hole. If any of this makes sense..? I am just tired of puchasing wrong brake parts for this car. If anyone has a picture of manual brake pushrod I would appreciate if they can send me a pic. My email is f68pontiac@msn.com Thanks, Chad