Those are found on a lot of SWB 911's and most 912's. The covers are Hella 356 stuff and are pretty pricey. I found repo's on Ebay pretty easily, they just don't say "hella" on them, but are what you are looking for. You can run several lights in the buckets, I found some Marchal Amplilux that run H1 bulbs, but they are pretty hard to find. I think they're just a standard 7.5 inch light.
You can find the whole assembly's on Ebay as well, usually listed under 912 headlights. Try the search 'Porsche hella' as well.
Here's the only pic I could find of mine.
Bill
