an in - dash radio installation kit , for installing a radio to a vehicle dash , comprises : a box - like molded plastic frame including walls comprising end walls and a main front panel interconnecting the end walls ; through openings in certain of the walls to pass fasteners that connect external brackets to the walls ; and ribs integral with and outstanding from those certain walls and extending frontwardly and rearwardly toward the openings , whereby corresponding grooves in the brackets may closely interfit the ribs to block twisting of the brackets . the brackets define openings that are registrable with the openings in those certain walls .