I had a low beam bulb blow on me recently. The car is fitted with a HID system. When I checked the price of the bulb I nearly died - $791 canadian.
I Found Sylvania make a replacement & can be purchased through Napa auto parts for $155 canadian part # is HID D1S.

 

what car are we talking about?




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Sorry - should of mentioned that - 2001 Seville STS

 

GM is very proud of their HID componets, I cant tell you why... if you can get a quality aftermarket part - go for it. Bulbs are made for GM by several different co.s However they are the only supplier of the headlamps themselves.