The MKIII uses sealed dual beam head lights. There is no separate enclosure for the bulb. To use H4 bulbs you need to get a compatible enclosure. Hella or Cibie e-code housings are about the best you can get (Cibie's being on top) and the the DOT housings from either manufacturer are a close second.... they're more expensive than the garbage on e-bay, but because they have the legally required cut-off so you don't blind on coming drivers you're MUCH less likely to get ticketed (happens a lot around here). Actually, I'm surprised you're doing it, you lose your hi beams and you live in Cali.... I know soooooo many people who've gotten busted for these there.... then again I know so many people who've been ticketed for just about anything there.
Anyway, don't get cheap enclosures, the light pattern is horrible (they don't light up the places you want it) and they blind everyone else.
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