I like the look of the C900 '79-'86 US headlights.
But the original US Department Of Transportation (DOT) lights were no good (the light isn't aimed well). The non-US 200mm replacement lights with separate H4 bulbs work great though. I've owned cars with both the 200mm non-US lights and with the the factory non-US ("European") head lights. With new lenses and new reflectors they seem to put out the same amount of light.
I would think you'd be able to buy the 200mm lights at places like Biltema. There have to be cars in Europe that take those headlights because they're a standard product and not designed for specific cars. They also fit motorcycles.
I don't like the Hella brand as much as the IPF brand lights. IPF also makes some nice bulbs that don't draw much more power but put out a lot more light.
One big thing to keep in mind is that the C900 headlight wiring harnesses aren't very good, you lose a lot of voltage. If you aren't getting full battery voltage (14.3v) at the bulb with the car running and the lights on, you're losing light. If you're only getting 12v at the bulb, you've lost 40% of your light output.
I put a HID conversion into my '86 900 once but these headlights are designed to aim a small filament, not a HID bulb which tends to put light over a larger area. I couldn't get them aimed right so they were blinding oncoming traffic so I took them out.
I think that will be a really nice upgrade. And it's legal too! 
