There are a number of four-headlight units that would fit. If you go to your local U-Pull-It, you should be able to find anything from an old Toyota Celica, or Corolla, to an E30 3-series, or early 5-series, that you could make fit. I had several reasons for choosing the E36 3-series, not the least of which was the offset of the lights (highs forward of the lows), and the smooth plastic bezel around the lights. The least expensive way to go would be to get a standard round set from one of the aforementioned cars and try to fab something. It is really more time consuming, than hard. Think of it as "mental masturbation," I suppose. If I were to go that route, I would still try to mount the lights high enough to eyebrow them underneath the leading edge of the hood, and, to continue the theme, black tape, or paint, the tops of the lights that are inset behind the edge of the hood. To cover the unit, OEM-style, use some clear GTS headlight covers. The only difficult part is making a clean bezel to hide your headlight buckets and bracketing.
As for price, my new TYC units came from Kelly at headlightwarehouse.com at $74.25 per side. Compared to all the headlight conversions out there for other cars, this seems like a relative steal. I spent some small dollars on wire, relays, aluminum, and Tracer parking lights ($12.00/pair), but that´s all gravy after the initial outlay.
I, personally, like round headlights, not only for performance, but for the "animation" it gives the car. By "animation" I mean that it gives the car personality, as if it has a face, that rectangular lights just can´t duplicate. For just that reason, I love the big pop-ups on our Miata. I wouldn´t have one of those headlight kits that eliminates the bug-eyed face of our Miata.
Good luck hunting.
Marcus
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[ Edited by stripedmx5 On Date 10-27-2002 ]