Most likely the best solution would be to buy a center section that is rebuilt for about $200-$250 and swap your housings onto it.
Rebuild kit is about $80 or so and can be done also if you feel up to it. I think the procedure is available over at gnttype.org.
I think Kirban used to sell the rebuilt center sections, if not try Postons, or Agressive Perf., or Johns Perform.
Or Mr. Craig, or PTE.