This is our HRSS designed kit that keeps the REV GEN4 motor and clutches in better alignment. This results in much less movement than the stock motor mount or anybody else's "fix it kit" . No need for pre-load tools because your motor wont move much with this setup. We include an upgraded Summit mag side motor mount, 2 poly torque stopper mounts with a shim that properly tensions the mount, 2 of our horseshoe mount shims, and a HRSS QRS shim kit for jackshaft alignment. Tis keeps your center to center longer and the motor can't pull back like it does in stock form. Less motor movement and proper jackshaft/secondary clutch spacing really do wonders for belt survival, better top speed, and cooler clutches. You can use our alignment bar with this kit and set your backspacing on the jackshaft really easily. Complete kit that you see in the pics is what you get. Purchase an alignment bar separately. Check our facebook page for a short video. The kit is the same except choose the proper QRS shim kit for the year of sled.