Alright, will check if I have 10mm or 12mm as soon as possible. Should be able to check when I get home this afternoon no problem (as long as it stops pouring...). My guess is that if early 2012's have 10mm mine will have 10mm, there are other things on my car that seem to indicate some 2011-ness like the existing threaded holes for the OEM strut tower brace and the fact that my fog lights have the old style bulbs (according to CamaroDIY). Just a hunch however. Thanks again for all the help and it's a relief to hear that I don't need the sway bar reinforcement brackets, not that they are expensive or tricky to install, it's just nice to know they are not at-risk.
"Driving is the only thing I love about f1."