Happy to finally have my own MX5. Picked up a black 2000 NBS2 from Ebay and have been enjoying it as a daily drive. Great fun little car

The tyres and brakes both need replacing, so am thinking to order some bits with the Exocet shipping container offer in the other thread. I'm considering the Direzza ZII or RE-11A 205/50R15 and 6UL 15x7 +36, can anyone confirm this will be suitable? I've done some searching and it appears to be fine with the NBS2 larger rear brake, but just like to make sure before going ahead.
Would someone be able to explain the rules with Class 2? I think I read somewhere no performance mods or R spec tyres allowed, is there a maximum width for tyres/wheels? I'm also looking for a strut brace with the brake cylinder stopper, is that allowed in the class?
Cheers,
Mike