Planning on getting 17x9.5" Silver ZR1's all around for my 91 firebird. I'm wondering:
#1 Do I require spacers?
#2 Can I use stock lug nuts?

 

number 1 depends on a lot of factors. 99 percent chance yes you will need adapters. Most likely a 2.25" adapter on hte front and a 2 inch adapter in the rear. But it depends on what application those ZR1's were from, whether factory or aftermarket, and whether you have your stock brakes and rear axle still. Do a search, there's good info on those, they're a somewhat common wheel. Very good looking wheels too.

Stock lugs should be fine.

 

Question #1 yes see above post for sizes. Not necessary on the rear if you swap in a forth gen rear end.
Question #2 yes the stock lugs can be used. But I would suggest locking lugs so your rims will stay YOUR rims and not some hood rat bastards down the street.

 

Could I get away with 2" spacers all around?

 

Since you're either unable or unresourceful enough to do the searching yourself, and I like to be helpful, THIS is the information you want to know:

http://www.skulte.com/adapterfaq.html

Unfortunately his website is down, probably forever.

Fortunately for you, I am resourceful enough to get around that. Go here to view the page and save it for your records:

http://web.archive.org/web/201306151...dapterfaq.html