68' Super Stock seat brackets inquiry

I think your brackets are on upside down....

I guess they could be. They wouldn't work with the narrow part mounted to the seat frame. The mount holes for the Jeep seat frames were different than the A100 seats. I did it the other way and then the brackets wouldn't line up with the holes in the floor. I had to drill new holes in the wider parts towards the outside edge to make it work with the seat frame. I didn't want to drill a bunch of new holes in the floor so I drilled the brackets instead. I put a brace across the front to keep the brackets from tilting inward.