The only thing I can think of, with the fin on top and the Orange lens, is an after market light for a Motorcycle front fender, like on an old ElectraGlide full dresser.
UK Comet is right, they're aftermaket front fender lights, and you can still get them. Here's a link to J&P Cycles Fifties-Style Chrome Fender Lamps they are $18 each.
Right on! Hell, at $18 each, I'll buy a fresh pair. I think they'd look cool for front turn signals on my A Sedan. I'll have to find some deeper headlights so they fit. (longer taper) I like that truck roof clearance light idea too, might look strange on my '71 Chevy though.........
i think i saw one at a swap meet it was cool but overpriced, it was on on a stalls with heaps of bike stuff, and an arse of a seller.
can't be many on the board that have a clue about "Buck Rogers" I got a fortune cookie at the Roadster Show that said "seek the wisdom from your elders" those elders are getting harder to find!!