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Last February Tfringo here on the forum mentioned 5, maybe 6 types.
Waffle
Triangle
Diamond
RBW
DMC
And possibly no stamp or a large circle around the face.
Good news is if it's not documented no one can say yours are wrong.
I actually called a dealership with the part number and they gave me all the dealerships in the Ohio, Michigan, Indiana area that had any in listed in stock. When I called, I asked specifically for those with DMC stamping, and that seemed to be the majority of them.
I called enough places to get a set of 20. Paid more in shipping than what the nuts cost.
Interesting question, and I never looked close at any c3 lug nuts. Too cold to go out and look now for any markings. NCRS does not judge lug nuts and does ask to remove hub cap.
Ed
Interesting question, and I never looked close at any c3 lug nuts. Too cold to go out and look now for any markings. NCRS does not judge lug nuts and does ask to remove hub cap.
Ed