If you have a plastic license plate holder on the front of your vehicle and want a plain license plate frame for it, you probably need a tight-fit frame. Tight-fit frames are the same size as the license plate and actually mount on the face of the plate (they don't wrap around as regular frames do). Tight-fit frames are 6 inches by 12 inches. They look just like other frames, are (coined) made in the USA, are warranted for life against rust, and come with hardware and matching screw covers.
You can find tight-fit license plate frames here: Tight-Fit