These are the RPM Black Front Left Suspension A-Arms for Traxxas 1/10 Summit, E-Revo, E-Revo Brushless, and Revo 3.3 vehicles. In response to repeated customer demands, we have a set of front left A-arms now available for the Traxxas Summit. Our front right A-arms for the Traxxas Revo (reference RPM #80212) are already compatible with the Summit but due to the extended T-Lock differential on the left side, our Revo front left A-arms would not fit. That is no longer an issue with these A-arms. With a revamped cross-brace to clear the T-Lock differential, our Summit front left A-arms will allow full suspension travel and significantly improve overall suspension durability.