Thanks! That would make it a 2" muffler clamp. The picture didn't post, but I got what you were describing. My thought is to use 2" aluminum angle for the crossbar and use the muffler clamps to clamp it to the rack frame. There's a connection I'm working on to connect the clamp to the crossbar. I got the idea from TrailMix from an old post.

Thanks again!

-Gonzo