This will explain it... a photo...

What that photo does not explain, and I have no photo, is why it has to be nearly exactly that type of clamp. That one does exist, obviously, but it's one not available to the public.

What you WILL notice is that it's quite easily made. 1 metal plate, 4 U-bolts(2 @ 2" and 2 @1 3/8" and 8 holes. That will probably be what I end up doing but first I'm going to try another I found that might work with a little customization by sledgehammer and lots of cursing. - JamesJM