A license plate mounting bracket for vehicles having horizontal grilles, includes a license plate holder coupled to a license plate holder mount that has an adjustable clamp that includes a first jaw and a second jaw. A male-to-female standoff includes an axial threaded hole at a female end thereof, a shoulder engaging a front end of the first jaw and a male threaded portion passing through the first jaw and engaging female threads in a hole in the second jaw. A horizontal stabilizing member is attached to the first jaw of both the first and second clamps to hold the first jaw of the first clamp in a fixed position with respect to the first jaw of the second clamp.