The part itself is very good. I put it in my Rustler. However, it is not compatible with ST Racing Concepts Aluminum Front A-Arm Set [SPTST3631GM] and ST Racing Concepts Aluminum Caster Blocks [SPTST3632GM]. When install together, the steering block will rub against the end part of the STRC A-Arm when try to turn. Traxxas aluminum is harder, so A-arm is scratched. Servo is also working really hard. I will have to put my plastic block back in or grind the A-arm.