Looking at a wrecking r33 it looks like it has the same four bolts into the floor but will it have the same mount for the seat
Highly doubt they'd fit at all.
Try finding some vzr seats if you want to stick with oem as they're probably a bit lower (someone might need to support this with evidence), otherwise you'll need an aftermarket low seat rail and aftermarket seat.
Otherwise get the seat re-upholstered with a thinner base cushion or cut and weld the std rail (this will have to be engineered if you're worried about being shaken down by the 5-0).
do you/will you track your car? If so it might be worth knocking two birds with one stone and getting a fixed back Sparco. You will sit alot lower and it will also keep you nice and tightly grasped for some spirited driving