Hey There 'anv2tk'! I think you picked the right forum to join, I think I have got better info here than most sites and they have Great Moderators here too, like TTMan and others. This seems to be a challenging subject because from what I have been reading that different wheel manufacturers can have a different offset than others which, for me, gets fairly confusing sometimes. There is a lot of money at stake if you pick the wrong set of tires and wheels, if the seller wont take them back.
My Advice, for what its worth, would be to buy them from a place that deals in them all the time like CZP (Coz or Ray) and get their opinions and agreement, if possible for return if they don't fit or if you see wheels on someone else's ride that tickle your fancy, find out what they have, where they got them and copy cat them. I really haven't had much luck on any forums with solid answers because there is so many different combinations of wheel sets out there and the main mistake would be getting them too big in the first place or "fixed" offsets that you are not able to play with spacers to get them to fit so they don't rub on the fender wells and the inside.
I have 5- Z32's now, 3 of which are daily drivers with one of them dyno tuned at 605 rwhp
, 2 - NA's (1990's) one is auto, the other is 5 spd. and I have 2 junkers for parts of which one is a '90 TT 5 spd and just bought a '90 2+2 auto for 650 bucks. So, good luck in your search and if you have "big plans" for your NA, take my advice and I'm sure most others will agree with me.........a big bank account. Z32's are not cheap to fix them up properly with OEM or Hi-perf parts but in the end, it is worth it because they are beautiful cars and deserve the respect. The first Z32's are now 23 years old, some in good shape, some not. I had a Z31 and thought it was "all that", well the Japs took the Z32 edition to an all new level back in the day and I get people gawking at my "girls" all the time and compliments like you wouldn't believe.
Z32's are like women, if you don't treat them good and take care of them, they will cost you big coin in the end.....