This time I have looked at GCR and I can't find it, I have nascar bars in my car, and the top bar sets to high for ease of access into and out of the car so I decided to put and X bar into the drivers side, i know there are tubing requirements and such but i can not find any build dimensions about this I.E. center of X must be 6 inches from sill area of door, is there something I am missing or is it pretty much wide open.