Same here - I have a 12 MCA and I'm looking for that 2013 gloss blk decklid as well. I've looked around and spent some time asking around. Nothing seems to beat purchasing one directly from ford. I shop AM but their's seems to leave a gap (check out the video).
My local dealer can get me one for 225.00. Expensive but not much more then the CF decklids I've seen. This seems to be one of those appearance mods where you get what you pay for. And to get what we're looking for we're going to have to pay. Can't cheap out on this one.