Pegasus, Cartridge X3400001 Balance module 19910PBX, Can anyone identify this shower cartridge?

[ReillocSW]

I cannot for the life of me find a replacement for this cartridge. I think it's a Glacier Bay but there are no markings or part numbers on any of the cartridge or faucet parts.

Any help would be most appreciated.

 

[Marlinman]

This combination was used mostly in Pegasus valves. Enter the following numbers in your search engine.
Cartridge X3400001
Balance module 19910PBX