Just a thought as I have read through this thread. I think I'd be a little leery of the two-piece mounts that have the front base screwed down onto the receiver ring--like normal bases--but the rear mount screwed into the side of the bridge. I would think that it might be difficult to get the two rings perfectly aligned because of manufacturing tolerances, etc. If it were me, I'd definitely go with one of the one-piece mounts like the EAW side mounts shown earlier in this thread. They are certainly pricey, but they should put the rings in perfect alignment.