WoW! those are fantastic! I've seen some like those on a late 50's Ferrari, but not on an Alfa, though as bumper, or inside the grill mounted, no reason why not.
(Nice floor! Looks like mine!)
I found some very similar Marchal 660 spotlights today. Several good used (all needing rechroming) at about £100/pair, and a brand new one for the same price. I'm told there are more where those came from. Good deal?