Thanks! The rims I asked about are not on the car now, wondering if they fit...Craigslist deal... But guy told me they were cracked, so def a no go! The rims on car now are ugly aftermarket chrome ones, brand and width unknown, but 17" front and rear. Looking to replace as soon as possible. Thanks for the info, could you post some general parameters I need to know, such as recommended width front and rear and back spacing? Like I said I tried to search, but browser doesn't work correctly on my phone. Feel free to pm me if this isn't a good thread to talk about this...I need to buy a freakin computer lol...thanks for any help!18x7.5 is too small. I bet you have the wrong kind of wheels on that Z. The previous owner probably didn't know what they were doing.
Tell us if you know the offsets, though. I guarantee it's off.
You should go with at least 8" for the front wheels.