SS/B Barracuda project

One would think at least one bolt and a hole in the floor should match, but due to the width of the bracket and how they are bolted to the seat, it rides on the tunnel and profile on witch bench seat is to be bolted. But I let the pictures show what I´m trying to explain.
Here is how bracket is bolted to the seat.
20181007 Hurst bracket to seat.jpg
the rail along the side of the seat is lower than rail going across front and back of the seat. This means alu bracket is not bolted level to seat, since rear of bracket is bolted in the rail going across of the seat in the back. Anyway this give holes (to floor) in the bracket a certain "bolt pattern" witch is important.

20181007 bracket to seat alu plate.jpg
I use an alu plate to level bracket to the seat. Since my project is as raced first season, this my very well have been done to move seat in a more comfortable position. I can now move seat on brackets without unbolt the brackets to the floor if I want to move seat forward.

20181007 Hurst orig..jpg
This is how Hurst bolted the seat. Front right bolt in original hole in floor.
"Someone" very recently told me a spacer/pad may have been used. (No all cars may have been alike as we know) I assume this is way. To clear left side (right on photo) of the bracket to the floor profile.
A new hole just behind and to the right (left in pic)of the original hole (arrows) in floor was punched. See last picture.

orig. seat brack and spacers.jpg
Very early picture of driver side bracket showing inner edge of bracket is not bolted down in carpet. Spacer is used?
This also show front of (left) bracket is tucked up in seat as described in first pic.

20180422 seat driver front and rear left.jpg
This is driver side left bracket mounting holes seen from underneath.
This very early picture shows exactly that. The larger hole in the center of the reinforcement is original hole in floor. Next empty hole just behind and to the right was done at Hurt (compare second pic above) The owner of this car has moved the seat back 2 some inches.
Also looks like a new hole in the alu bracket has been drilled in the rear of the bracket to use reinforcement in the floor.