[DADZZ64]

hey guys i have been trying to figure out stuff about my rear end i want to make it some what posi and was thinking about putting a spool in it i was looking at summit racing and see a few options but i dont know what size i need to use : Spool, Mini, 26-Spline, 10-Bolt, GM 7 1/2 inch or Spool, Mini, 28-Spline, 10-Bolt, GM 8 1/2 innch iam very new to the rear end stuff and need help is the rear end a 10 bolt or 12 and what size spool will fit .. if this is a dumb question sorry but i gotta find out some how ..and also what rear ends will fit a 64 bonne???