Finally, after 2 years and 20K miles, I killed these 245/50's.
I bought four GM 17 X 9.5 ZR1's, but I got no lugnuts with them.

I don't know if the ones I have will work/fit properly onto the new wheels, or If I have to find and buy new ones.

Any insight at all would be highly appreciated.

 

The ones you have will work but will look ugly with the exposed lug holes of the ZR1s. I picked up a set of chrome OEM lugs from a Monte Carlo that have the same thread as the Camaro does for like $15 shipped last year. They look way better than the stock lugs with the cheap plastic covers.

 

you can go to a advanced discount auto parts or autozone to get some chrome lugs

 

You can but stay away from the Gorilla brand ones. The chrome is thin and they rust real easy. McGuards are good but you'll pay about $50 for a set or more.