The Heidt's is the top of line in comparison to the others. I have owned or helped to install that,Fatman,C.E. and R.B.s and others. The upper arm are a different type, once you align, you don't mess around again. If you have already planned to use the Heidt's and find the price agreeable, then I would not even bother with the rest. There is more info on Chevytalk, do a search if needed. Good luck to you. Jon
