3 similar, but different Hot Rod Hiboy Headlight Mounts.

Usually bolts to top of frame rails.

The longer polished S/S ones made by United Pacific Industries. Approximately 4 3/4" tall. Distance between center point of the headlamp and frame mounting points is 4". They have a 5/8" hole to mount your headlamps.  

The shorter S/S ones are made by So-Cal Speed Shop.Approximately 4 1/2" tall. Distance from centers of headlamp and frame mount is 3 1/4". They have a 5/8" hole to mount your headlamps.  These are not supplied with rubber base gaskets.

The Black ones are made by Jen-E Distribution. Approximately 5" high, Includes rubber gaskets and s/s hardware. Headlamp mounting hole is 1/2" ID.