ve onan pump case same as 12v ve case.

[cumminsram]

Im in need of a pump case for a ve rotary pump because the one on the truck is cracked so we removed it. Is it possible to put my internals from the 12v pump with a 12mm plunger to the onan pump case with a 10mm plunger because all we need is a new case? Or does anyone know of a cheap ve case or cheap pump because all we need is the case.