Bench to Buckets...need help!!!

Ok, I am installing Procar racing seats in my '75 Sport. It originally came with a bench. I have both seats, but only the left bracket as of right now, the right side should be here next week. I tried to mock the bracket up in the car, and I don't see how this bracket (which is supposedly specific) fits in my car.

Dumb question, but is there a difference in floor boards between bucket and bench cars? I can get 3 mount points to sit on the floor, but the front left point is in the air. I don't have a bucket seat car for reference off hand. I'm assuming that I am doing something wrong.

There were no directions with anything except a very generic pic of how to mount the adapter to the seat.