RPM has come up with is a blending of design between their extremely popular Slash 4x4 A arms and an all new design specifically for the Rally ST Telluride They have eliminated the slop in the suspension system tightened the tolerances around the hinge pins reduced the fore and aft movement of the A arm at both the inner hinge pin and at the axle carriers and improved the durability dramatically As a bonus these A arms are lighter than stock 1 5g ea or 6 grams for a full set of four RPM A arms are molded in a blend of incredibly durable nylons and are backed by an industry leading Designed manufactured and produced right here in the USA Features . Fits the Telluride ST versions of the Rally. Does not fit the Slash 4x4 Stampede 4x4 Rustler 4x4 or Rally 4x4. Each a arm is 1 5 grams lighter than stock. 2 packages needed to complete one full vehicle front rear . Replaces stock Traxxas No 6731 Specifications . Position Front or Rear