280zx are very similar to r31 struts, in the same kinda family of struts, see here.

wheels with 0 or neg offset will always hang out the guards with stanza or larger struts. ive got 200b/stanza struts in my car with slightly lengthened control arms, i think...i forget where i adjusted them too, and 200b steering arms which give a little bit more track increase. my wheels (15x6 +20 offset) sit about level with the outside of the guard
ive probably got 5-10mm extra track over standard stanza stuff

if you want to run 15s or a tyre of similar size to a 195 50 15 then you have to cut the guards, otherwise the tyre will at some point catch them and bend them
Alot more apparent when you have adjustable castor rods aswell and pull the wheels forward a bit more
Mine with the castor adjusted as far forward as it can be gives the wheel about 5mm if that of clearance to the guard with about an inch or more, probably more, cut out of the front of the guard

Pretty much the way i'd go about choosing struts, is to first choose the wheels you want to run, and then the brakes you want to run. then choose a strut that works with both, or offers a good compromise