Hella makes a conversion. It is very good. I tried the cheapos, but it was not worth it. The reflector was poor, the glass was cheap/thin and of poor quality.

Hella's conversion has a good reflector, nice cut and distribution on the lens. I cracked one a few years ago and was more than happy to buy a replacement. They are about $40 each through Summit and you cannot beat Summit's customer service.

Good Luck,
Michael