I recently switched from the leather seat to these from Jegs https://www.jegs.com/i/JEGS/555/702265/10002/-1

I had to modify my aluminum center section to make them fit.. I wish I’d bought 16”. The dimensions aren’t what you expect (or what they tell you). Also pretty hard to get into a built car with a hardtop in place!!

But now they are in, they are amazing. Much more supportive, comfortable and the thin cover doesn’t get uncomfortable even after long trips. IMO they’ll give you more leg room but I didn’t do it for that