The side mount brackets will fit that seat, yes, but you the still need to work out how to secure those to the floor, keep it level and not mount it too high, which is the challenge....
I think we've found some decent side mount seat rails for S13,S14,R32,R33 but they won't be here until possibly mid to late march
The Sparco Pro2000 and Bride frame arrangement just requires a little playing with...
Mount the inner side first (Its a set of runners, not a frame) and then fit to the car. Mount the other rail on the outer side and then mount the rail to the seat.