Newbie needs some help, please. I've got a 1985 12A RX-7 running SCCA ITA. I believe it was originally a Pro7 car out of California (tokico illuminas, front coilovers, six-point welded cage, stock motor and carb, 4.77 LSD)

I've got the chance to strip a 1985 GSL-SE street car, roller (no engine or tranny). It's been stored outside for a couple of years and about to get junked.

What parts can I take from the GSL-SE and put onto my 12A race car and still be legal?
Can I run the GSL-SE bigger brakes and bolt pattern?
Should I grab the rear axle/differential?

I will probably grab fenders and doors for spares.
Anything else?

Thank you for the help.