check out this link
http://www.schrothracing.com/sdocs/2...structions.pdf
my plan is to run a removable harness bar without a cage for a set of the schroth harnesses and run 3 points off the harness bar attachment points when the bar isnt there. i really dont like how the bolt in 3 points hang so much "stuff" from the roof that just dangles there so i want them much lower and a little more hidden.
read over schroths site and check out the crash test videos. there is a lot of info on 2" vs 3", belt angles, anchor loads and requirements etc.......
here is a site that has given me a couple ideas for the 3 pts. some of their installs seem to put the shoulder straps a little low, but mock up on my chevelle shows i will be right at the 20*.
http://www.quickfitsbs.com/gallery.asp