You already know RPM A-Arms are the toughest molded A-Arms in the R/C industry (Gram for Gram, stronger than aluminum as well)! each RPM A-arm is molded from our trademark blend of nearly indestructible nylons and backed by our world-renowned limited Lifetime warranty against breakage. RPM durability combined with RPM affordability; there's no way you can go wrong! Tech notes: RPM wide A-Arms for the Traxxas Rustler and Stampede 2WD fit all electric versions of these models, although additional parts (not included) are required for completion as listed here: Rustler XL-5: 1 – RPM screw kit #70680, 1 – Traxxas #3643 (long camber links), 1 – Traxxas #3645 (long toe links) and 1 pair of front wheels (used to replace rear wheels). Stampede XL-5, Craniac and Skully: 1 – RPM screw kit #70680, 1 – Traxxas #3643 (long camber links), 1 – Traxxas #2338 (long toe links) and 1 pair of front wheels (used to replace rear wheels). Rustler VXL: 1 – Traxxas #3643 (long camber links), 1 – Traxxas #3645 (long toe links) and 1 pair of front wheels (used to replace rear wheels). Stampede VXL: 1 – Traxxas #2338 (long toe links) and 1 pair of front wheels (used to replace rear wheels).