This is a full set up kit to do the job right. It includes:
-Crush Sleeve or preload shims
-Adjustable Differential Shims
-Ring Gear Bolts
GM 10 Bolt 8.5 MASTER INSTALL KIT
All of our bearing kits come with either Koyo or Timken bearings, which would be made in Japan or USA. Although Timken does have very few made in other places. Both companies are tier 1 OEM suppliers.