Next, cut off the surrounding mounting flange and silver solder a 1½" 18 gauge steel ring in its place.

After constructing a plywood and posterboard template of the area in the bus that you wish to mount the lights in, insert the modified lights one at a time, align using whatever resources you feel are necessary to make it look right, and then scribe a line around the circumference with a fine tip felt marker. In this case, each of the three light must be scribed differently, as the template is curved, and the lights all need to be aligned in the same plane.

Using your expensive but totally useful pneumatic metal shears, cut the lamp shell on the diagonal along the line you scribed in the last step. Watch out for sharp metal fragments!

Insert the lenses, then install the lamp holder in the template. Finis! It looks wonderful! When the lamp assemblies are welded to the sheet steel that replaces the posterboard, careful use of the grinder and then body filler will result in a smooth finished appearance.