Can anyone help ID these wheels...

[dieselpower91]

I have had these sitting in the garage for years now.

They were from an M3 Cabrio.

I am having a hell of a time finding what brand of wheels they are.

The fronts are 20x9 with 1.5" lip
The rears are 20x10 with 3" lip

They are very light and have no markings on the wheels other than the 'C' on the center cap.

The chrome is pitted and peeling. I hear it's difficult to refinish them?

[dieselpower91]

Pic of the center cap-