Thanks! Still with the gap like the RRS L-bracket. I hope the 1D X brackets are a closer fit.
You mean the little nick-out where the TC-80N3 plug sits?
Exactly the reason I went for Kirk over RRS for my 7D, Kirk has the nick but RRS has a complete hole, their bracket is more of an open-loop, just looked a lot more stable than the RRS version. Looks like they've both done as before for their 5D3 model.
Kirk 5D3 model does look like it's got a a bit more distance camera-clamp though. Maybe they had to stand it off further for the new inputs?