Bench to bucket seat question, 1970 Dart

I've done this a couple of times myself, and the dimples in the floor should line up with the stock A Body brackets. Some people try to reuse the two holes on each side that the bench seat used, which is wrong. Right in the middle of the floor pan, there should be four dimples that should line up with the stock A Body brackets.

Are the four dimples that you are seeing approximately 12" x 12"? I've drilled the holes before, and then had to get a little rough with the brackets to get them in all four holes at the same time.