Our products are totally interchangeable with that of the OEM (Vickers,  Denison, Yuken, Tokimec, ATOS, Caterpillar), cartridge kits and other parts: cam ring, shaft, seals for the like below:
 ATOS PFE single vane and PFED vane pump cartridge kit:
 double pump: PFED-32, PFED-42, PFED-43, PFED-53, PFED-54 series
 single pump: PFE-21, PFE-31, PFE-41, PFE-51, PFE-61, and PFE-22, PFE-32, PFE-42, PFE-52 series 

and also below available: 
Tokimec SQP series vane pump  interchangeable cartridge kits
Denison T6C, T6E, T6D, vane pump cartridge kits
Yuken PV2R series vane pump cartridge kits
Vickers V, VQ series vane pump cartridge kits
and CAT vane pump cartridge kits.