On my car, and all the ones I built, I made a simple bracket, to hold the rear end in the center, and at the right distance from the motorplate, and at the correct height, so once that is in place, all I have to do is make sure the birdcages are in time, and adjust the radius rods, plus tweek them with the stagger and weight in it on the tires. Takes about 10 minutes to install the bracket/saddle, and you're ready to do some measuring. And, of course you can use a laser to meaure with, that makes it a bit easier if you are working by yourself. KISS! Bob!