Hey Andy,
The floor brackets funnily enough locate into the floor to give a predetermined width. It is unlikely that this will suit your seat width, length or locate the seats in the correct position to the pedals and steering wheel. When I did mine I made up some brackets that run across the width of the seat and hard mounted them to the floor brackets. When in the correct position they are not actually centered above the floor brackets. The same method could be used with rails, they would just sit ~15mm higher.
I don't know the legality of adjustment. If mine was a road car I think I would want the adjustment. I have some rails if you need some, let me know.
Cheers,
Will
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