do the wheel nuts for stock steelies fit Si rim's as well?

I have a 97 Civic Ex

 

Yes, but they wouldn't sit right. The wheel lugs that are holding your steelies have a round bottom (as well as that little plastic rim that holds the hub cap up). Wheel lugs that hold Si wheels have a conical bottom. You're gonna have to get a whole new set of wheel lugs for them to sit properly.

 

I think I know what ur saying.. cause the stock steelies aren't as thick as the Si rim?

I'm also in the market for some lug nuts, any suggestions? or would OEM honda lug nuts go well for Si Rims?

 

You could just go to any wheel store and purchase some close ended conical wheel lugs (12). I say close ended just to help prevent rusting of the wheel stud. Then go to a pep boys or an autozone and pick up some wheel locks (by gorilla or mcgard).

 

What size lugs do I need?

 

12x1.5