This rebuild/reseal kit is for Shadows and derivatives that use RR363.  This kit is not for later SZ cars using mineral oil.  This is the most complete kit available as it includes not only new EPDM o-rings but all new retaining rings, non-return valve sealing washer, springs and the seal for the fluid feed pipe as well.  Cars before ***6644 don't have a fluid feed pipe seal.

This kit also includes a new stainless piston retaining collar. Oftentimes, these piston collars are heavily corroded, so I made a run of new stainless collars with which to replace them.

BTW can rebuild and test your pumps for you for $225 ea. which includes the cost of the kit.