Brass Currie F9 Portal Steering Knuckle Caps Color_Metallic and there are many possibilities

and there are many possibilities for kitbashing too

along with assembly diagrams

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Brass Currie F9 Portal Steering Knuckle Caps Color_Metallic and there are many possibilitiesDetails: Hot Racing heavy brass outer portal drive housings Cover for the front (typical application) or rear of the Axial UTB crawler and SCX3. Adds weight to the Axial UTB crawler or SCX3 where it needs it down low. Lowers the vehicle's center of gravity, increase its stability, and make it an overall more capable crawler. When used on the front, these weights aid climbing and help reduce the chance of flipping backwards.