Hyd Pumps

[GMPoland]

Both of my pumps were returned from qaa as unserviceable. No luck on locating replacements within reason. Any serviceable cores available ? Alternate Part numbers ? Many accessory overhaul shops cannot get parts. My quote was over 3000 each for overhauled units without cores. This may ground a few of us unless a source for parts or alternate part can be located.
Any members have a solution?