This is the Differential Bevel Gear Set for the Kyosho MP-7.5 Kit.

Aluminum construction

Two Large Bevel Gears
Four Small Bevel Gears

These would go inside one of the differentials in the MP-7.5, but are
a direct replacement for the gears it comes with.

Teeth: 20 (Large Gear), 10 (Small Gear)
height: 6mm (Large Gear), 6mm (Small Gear)
diameter: 19mm (Large Gear), 12mm (Small Gear)

These are used in Front, Center and Rear Differentials.
rws 9/24/00
ir/jl
this information was sourced from Great Planes Model Distributors