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I can't find a reference for those numbers but I'm guessing S/D is single post/double post.
I found universal bases at NAPA that insert into the original socket when I made changes to my light systems.
Bulb looks similar to ones on a 86 Honda goldwing, maybe check them out
Do you have something specific? My search does not show use of this style, which is not surprising as 1986 is a bit late. Best I saw was another obscure bulb interface type, P25D, used for the cornering fixture.
The sockets are a standard bulb interface, P30S or P15S30A if my research is right. They were used in headlight fixtures, spotlights, handheld flashlights, emergency vehicle lights, scooters, motorcycles and similar from the 30s-60s. My particular need is for a 6V Federal Model WL.
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