Mike,
For racing I replaced the stock seats with some Kirkey aluminum racing seats. Being that my car is just for race and I was more considerate of safety than being original, I used a full racing seat for me and used the more vintage looking seat for the passenger. I have Racequip 6 point harnesses, both seats have the hole in them for the crotch links. I did not install the shoulder harnesses on the passenger, as it is just for looks.
Good luck.
Jim