Push rod (aluminum) (assembled with rod ends) (2) (use with long travel or #5357 progressive-1 rockers) Revo & Summit’s linkage-based suspension requires different push rods depending upon which rocker arms are used. These ultra-strong 7075-T6 red-anodized aluminum rods decrease the total weight of the truck by 31 grams. Rod ends are already installed making it simple to just bolt them on the truck. When using progressive-2 rocker arms, spacers 5133 are required for use with the 5318 or 5318X push rods. These spacers are included with the progressive-2 rocker arms.