Mazda RX-8 Workshop Manual page 1516

Bearing Cap Disassembly Note
1. Mark the bearing cap and differential carrier for proper installation.
Adjustment Shim, Side Bearing Outer Race Disassembly Note
1. Remove the adjustment shim using a flathead screwdriver.
2. Put left and right identification marks on the removed adjustment shims and side bearing outer races.
Side Bearing Disassembly Note
1. Remove the side bearing using the SST.