Lug Nuts

Alright, my 1974 Dart has a set of crappy rusty regular nuts holding the Magnum wheels that the previous owner added on.
The wheels are pretty decent, they could use a repaint, but thats coming soon.
However, these shitty rusty nuts and the rusty studs that are sticking out of them make them look way uglier than they are.

I'm not currently home, I'm at school, but I want to pick up a set of chrome lug nuts to put on it from Advance Auto (theres one literally 5 minutes from my campus)
It would ordinarily be possible for me to just measure them, but being that I'm not home, thats difficult.

Can anyone tell me what size lug nuts to get?
I don't expect the people at Advance to be able to tell me without me having to answer 55 questions...

Thanks!

PS: My Dart has the front discs and the big bolt pattern.