I have a 69 ss396. where the front seats bolt to the the floorboards the bolts are exposed. Did they make a plastic cover to hide the bolt heads?

I believe there were covers on both the inboard and outboard bolts. The inboards were a more flexible soft plastic and the outboards were a harder plastic. That's how they were in 72 anyway!

The bolts that hole the seats to the floor did not have any type of covers in 69. The carpet was cut and the seats were bolted directly to the floor, then the carpet flap covered the bolt to a certain extent.