pretending 1200 and 120y struts dont exist

all nissan datsun struts from sunny (310) to the z31 have the same 50.8mm strut tube, except the 240 260 and 280z
also the bolt spacing for the steering arm is the same for all except 240 260 and 280z

sunny and 1600(i think) have a smaller stub axle than the others, so wheelbearings arent actually the same

stub axle ange is the same for most, 280zx r30, r31 and maybe z31 have a greater angle giving greater wheel clearance and less camber

stanza 200b (small offset) and 240k (small offset) struts all that the same stub axle assembly, includes caliper mounting

200b and 240k large offset and the same struts

r31 r30 bluebird and 280zx??? all have the sameish stub axle assembly
ish being that bluebird has a different stub axle angle

sunny and 180b almost have the same stub axle assembly, sunny having smaller stub axle

wouldnt ever use sunny struts, stanza struts are only good if you plan on cutting them down and fitting shorter shocks

the rest are all fair game, r30 r31 and 280zx all have the shorter inserts im pretty sure so should ever have the need to fit shorter ones

really depends on what sorta brakes you plan on running as to which struts you choose