"I need to mount a front license plate on the front of my car, but I can't find any mounting holes."I don't think you're missing the license plate mounting holes. There is a factory-installed license plate bracket that you can order for your car. You'll need the following:
With out Y82 Option [Indy Pace Car]:
P/N 10024283 Bracket, License Plate P/N 10022805 Adapter, Frt License Plate (for right side of bracket) P/N 10022806 Adapter, Frt License Plate (for left side of bracket)
or
With Y82 Option [Indy Pace Car]:
P/N 10037303 Bracket, License Plate P/N 10036682 Adapter, Frt License Plate (you'll need 2).
I called the GM parts asistance line and they are all available with a total cost of around $20. Good Luck!
From: Bret Scott