It's not a Street Beasts and I've seen that sectioned inboard rocker on some FiberFab speedsters. The elongates "U" fiberglass piece mounts on top of the rear 2 x 2 and that gets a foam Bus engine seal that rests against the engine tin. You'll have to fabricate up the small 2.5" x 12" pieces that mount along the side of the engine next to the heads. ( also uses the foam bus seal) The other FG piece mounts under the rear 2 x 2 to deflect the exhaust heat .