WTB: 4 Spider Center (89-91 gearset) or non-worked center diff

[citymunky]

I'm looking to replace my Jack's welded diff with a TMZ or TRE 4-Spider center diff for a 1989-1991 gearset.

I'm also open to buying a stock center diff for a early gearset to be serviced , but I rather just buy the 4 spider and save time.