We have received numerous requests for a set of extended rear A-Arms to fit the Traxxas Summit and Revo. When you speak, RPM listens. As a result of your requests, our extended rear A-Arms for the Traxxas Summit and Revo are now available. RPM extended rear A-Arms are designed around our already solid and proven Revo rear A-arm design. That means you get an ultra lightweight set of A-Arms that are nearly indestructible! each set of RPM extended rear A-Arms incorporates all stock geometry including options for either a 10mm or 19mm extension. All RPM molded products are backed by our limited Lifetime warranty against breakage and are molded in black or blue. For unmatched performance, reliability you can trust and unmatched durability, you can't go wrong with a set of RPM A-Arms installed on your ride! Tech notes: RPM extended rear A-Arms are replacements for Traxxas stock #5333R. 6mm bumper mount Spacers (not included) and M3 x 16mm screws (not included) may be necessary if installing these in place of standard wheelbase A-Arms. Please review the installation instructions via “downloads” for technical information regarding the installation of these A-Arms.