I have over the years changed both vacuum pumps....
Looking thru my records, I changed the front because it failed back in 2/95, it was a 441 CC from Aircraft Supply and Repair in West Mifflin PA. It was $459.00 exchanged. It now has 500+ hours on it.. I recently changed the rear 2/02 just because it had 700+ hrs on it and the starter drive was out. that one came thru Van Bortel Aircraft (Ken) It cost $350 exchanged.. My Mech suggested the O/H ones because you have (2).. Had to wait a month or so for the core credit thru V.B... Guy, old72driver....
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