Yes, the mount is vertically adjustable with shims, but I don't recall by how much. I have to call them in a bit to discuss other issues, so I'll ask and post their response.
You kinda have to think of every possible problem someone might have installing and using this new mount or you'll end up having to answer numerous questions after the sale. Centering left to right is another small issue but that can be easily solved by shifting the new mount left to right as long as the installer left enough material on the original cross member (on the inside "cut" surfaces). I think that I would have probably welded a 1/8" plate to cover the hole (opening) on the old cross member. This 1/8" plate would be large enough to extend into (onto) the new mount ensuring that the "twisting motion" is transferred to the new mount (and the seam welds). But what do I know???