Set of Steel Trailer Square Tail Light Mounting Boxes One right and one left (with opening for license plate light) Fits standard square trailer tail lights for over or under 80" wide trailers Made by 13 ga heavy duty steel Light box dimensions: 5-1/4"L X 5-1/4"H X 3"D, side open: 3-5/8", rear bolt slot space 1-1/2" apart