The rail attached to the pipe keeps the body at the correct angle. I got a u-bolt from Victor, used the second hole on the far side as a guide to put hole in the tall rail, and got a longer bolt to go through both rails. The u-bolt goes on the pipe. You also need to drill holes for the u-bolt to slide into that tall rail. Hope this helps a bit and if not Victor and/or Mike could explain better than me.