Mazda Motorsports registration?
 

What is the easiest way for me to get an account with them? I have sent them pics of the car and explained that I race it both on the dragstrip and road course track days? I have never been to an SCCA autox or NASA sponsored hpde. I NEED to get my hands on the parts to rebuild my t2 s4 lsd! Will an scca membership be sufficient? TIA-Garrett

Yes, you just need to tell them when you expect to run the car the first time and then send them results after you do (twice).

The easiest way is to just do 2 autocross events, they don't even have to be SCCA. Submit the results and you're in.

Track days and just running on a dragstrip don't count. It must be a competitive event with posted result sheet, showing your name, your car, date of event, and your place. All this info is on the web site. Have you sent them a copy of your SCCA membership? As posted above I know that there used to be a temporary membership during a build.