Technic, Steering Axle with 2 Pin Holes and 2 Arms with Axle Holes with Slots with Dark Bluish Gray Wheel Hub 3 Pins Round (23801 / 92909) : Part 23801c01 | BrickLink
REVIEW] 42129 - 4x4 Mercedes-Benz Zetros Trial Truck - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums