New to everything
 

Hello! I just got my first rx7 it’s not my specific dream model as I’d like a t top but I have a convertible hard top, I’d like to have it be a practice drift build but I have to redo the entire interior first before I even want to try to change anything mechanically wise, I was wondering what would be a good site for bucket seats, racing harness, new vents, dash, door panels that stuff any info helps though thank you all :)

Welcome to the club.

Seats and harness could be anything from ebay or summit racing, depending on your budget and desires.
For mazda specific parts, mazdatrix has a good inventory on what's still sold new for these. Anything else you could find used on facebook groups, ebay, or on the marketplace here. Good luck.