It looks like 12 x 1.25 but I want to make sure. Also, what lug nuts do some of you have on your aftermarket wheels?

I think it's 12 x 1.25. Lock Lug Application guides should have it listed.

http://www.gorilla-auto.com/application.guide

Do you think it would make any difference if I wanted to run a 12 x 1.75?

Yes, that's a different thread pattern. I had found one site that said 12 x 1.75 but too many others seem to say 1.25 so I think it's a misprint. You can take one of the lug nuts to a hardware store and see which metric bolts thread into it, then you'll know for sure.

Yeah. Gotcha. Everywhere else I'm seeing 1.25 x 12... i'm just going to play it safe. :)

It is 12 X 1.25.