If you're currently shooting with an SPL A-Series with a 5d MKIII, then you're in luck because it has the same configuration as the 7d MKII. However an existing 7d housing won't work. If you have an aquatech, then it's a simple tray and backplate replacement, then you're good to go.
Have you actually tried it in a housing? It sure looks pretty close. Slightly larger, but not by much. If you have tried it, are all controls unusable, or are there some that are usable?