If you take one into the local parts store (Autozone, Advance, etc) they have a bin behind the counter with single lug nuts in it, usually by the "pro" desk. They have chrome capped lugnuts, you'll just have to look and see if they have the thread pitch and style you're looking for. Don't bother with the computer, just ask to see the parts bin in the back. They should let you, I've never had any issue.