Our ESC mounts for the Rustler bolts directly over the old mechanical speed controller’s servo pocket. It covers the old pocket to keep dirt out while giving you a nice, flat surface with ample room to mount any electronic speed controller of your choice. Furthermore, we mold these ESC mounts in two colors, Black & Blue, to match or contrast any body or chassis color. Our mounts are molded from RPM’s toughest blend of nylons, which are impervious to nearly all chemical compounds of cleaners and motor sprays, plus they are strong enough to keep your battery in place in the roughest of crashes! If you've upgraded to an ESC, then you need an RPM ESC Mount!