Harley Davidson "Passing Lights"?

Before the sealed beam bulb headlight, the old style head lamps had a multitude of varieties. The Packard had 2 separate bulbs in different locations in front of the reflector. The passing light was controlled by a different position on the light switch. When moved to that position, light shined more to the side front of the car, while the headlamp still shined forward.
 
Passing lights on Harleys (and other motorcycles) are just a pair of small sealed beams mounted on each side of the main headlamp. You mainly see them on "dressers" and Softails but H-D and other manufacturers make kits for just about all models.

Those particular rings appear to be the stock (couple custom variants available) approximately 4 3/8" diameter sealed beams. The only ones I have are in my bikes and I didn't have any spares with the trade number on them not installed.

They are available as clear fluted lens, clear unfluted lens, and amber fluted lenses. There are also some H-D and other manufacturer halogen ones available.

Guide Lamp Division of GM used to make these for Harley, my '82 had Guide branded light buckets. My '02 is unmarked but the rings are interchangeable.
 
the buckets would be the same as par 36. those clamps would mostly likely go on anything that took the out side ring with a clamp. they were called passing lamps because you were to flash them just before you went around the clear spot lens would be driving lights the fluted and amber fog. if they were red the bike was black and white
 
grote still make a light that has the clamp for tractors. but all you can get are white lens. you can get them in 6 volt still . like changing a bulb was that complicated
 

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par 36 is the 4 beam headlight size and 56 is the two light headlight size. the 46 is right in between. all the unity use the tab on top and one screw in the bottom. like a spot light. with a sealed beam. the ones that use a separate reflector and a twist in bulb with the glass lens have a clamp ring that holds everything to the housing. it has a horizontal screw that pulls it tight on a groove in the housing. the old tractor crowd is a good source for them.
 
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