R32 gtst and gtr, r33 gtst and gtr, r34 gtr and ceffy a31 are all the same! (r34 gtt is difference)
with those seat rail, 3 bolts will line up on ur 180sx or silvia. another bolt, u need to mod to fit. most peep who got gtr seat in their 180 or sil only done 3 bolts in their car
hope this help