This whole body thing is enough to make this newb want to give up plans to run the newly purchased 7.1 in USGT. It's absurdly confusing. Even the body manufacturers make it confusing. Yes, I've seen the ROAR list, but still, it's overwhelming.
Don’t overthink it too much. A good group shouldn’t make a big deal out of body choice for a “rookie”. Group I ran with let 2 of us run non legal bodies for half the races.