This is a Diff Gear and Side Coverplate with Screws by Traxxas.
FEATURES: White plastic construction.
INCLUDES:
One 45 Tooth differential gear.
One differential gear side coverplate.
Four countersunk screws.
REQUIRES: Assembly in vehicle.
SPECS:
Outside diameter: 37.5mm (1.48")
Shaft diameter: 5.10mm (.200")
Overall thickness: 21.2mm (.834")