Fuel Pump Part Numbers - T337F

[pwolfehagen]

I have a bad pump on the front and figure the rear is not far behind. I would like to find an overhauled pump to install up front now. And then have the bad one rebuilt to be installed on the rear at a later date.

The Cessna parts catalog calls out 629373-1A1.
Textron says this number has been superceded by 655921-2A2.

The actual pumps installed on the plane now are 634263-1.

Does anyone have experience with these part numbers and what will actually work?