WRD-BNC · Bison Body Components Bison Body Components Replacement Bison tool body components. The set includes the frame screws. Fits Bison assembly Part Tool body components Where to Buy Where this part is used Bison Assembly WRD-BNA → Main body screws M6 × 25 mm Phillips · set of 4 → Other parts for the Bison assembly Bison Ball Bearings → 2pcs set of ball bearings for the WRD Bison. Bison Spindle/Shaft → Replacement spindle for the Bison. Bison Spring Set → Replacement springs for Bison. Deflection Rods → 2pcs replacement deflection rods for the Bison system. Pump Plunger → Replacement pump plunger for the Bison.