I was wondering if someone could inform me on what pitch the bolts are that bolt the front seats down?
Thank you for you time.

 

I think they are 7/16"-20. I built my own harness bar, and the bolt that hold the shoulder belt to the car are definately 7/16-20's. I know that because I pulled the bolts out, looked at them and thought reasonably they would be metric only to find out they are 7/16-20. Argh. I would imagine the seat bolts are the same.