I snapped a bolt today while cleaning/replacing some components and seals today. It says s88 on top and is used to secure the metal component the holds the piston bar in place. There are 20 total of these bolts. I'm not sure what that part is called. I found that I cannot find this bolt at an auto parts store and must find it online. Does anyone know what kind of bolt this is exactly? And where I can find it? Also, one of those bolts was stripped and stuck in place. I pulled out all the stops and CANNOT get the bolt out. Ant hints or tips?