The rears are not the typical bolt flat against the bumper bracket sheet metal style, they were made so the rotisserie stubs could go inward toward the center of the car allowing for a shorter overall rotisserie rig. The same reciever hitch tubing with set bolt nuts welded on and angle iron welded at a 90 as was used on the front brackets but wider angle iron to allow enough room to space the bolt holes appropriately.

The mounts utilize the existing frame through holes at the rear of the frame (a large dia. nut and bolt) and the single/smaller threaded in bolt that holds the rear muffler hanger mount. An approx 2 x 4" piece of flat steel plate is used as a "washer" on the opposite side of the frame to spread the load and not pinch the frame material. The big 90 black clamp shown was added just as a safety to keep things in place as weight shifted, it's not really needed. Setup like this the car is rock solid and turns all the way around with one hand.

Be careful mounting your car so that it's centered and at the right hieght to be balanced when turning, also be sure all doors, hood, truck, etc. are wired closed. Get a buddy to help you and GO SLOWLY, you don't want a disaster and you only get one shot!