I don't know if these are legal in SM yet but in the prod classes and GT-Lite they are. I had the racing beat one on my car and it broke in half so we made some from 6061 billet aluminum. They will fit the NA and NB cars for sure - not sure about the newer ones.I made a couple of them so if anyone is interested i can provide pricing - just pm me. I will have some at the road atlanta majors race this weekend as well. Also going to be making the rear brace from billet flat plate aluminum next week if there is interest in those as well.