Maybe this will help take the guess work out of it. I attached a .pdf that I drew of the tabs I had welded on my I/C. It attaches directly to the frame rails (the bolts that hold the bumper support), tucks up nicely underneath, leaves room for the A/C stuff & leaves room to put the 1J overflow bottle in the stock location. BTW, the dimensions are 24"x12"x4"....
http://www.supramania.com/forums/showpost.php?p=402643&postcount=71
http://www.supramania.com/forums/showpost.php?p=402643&postcount=71