looking to get hids....dont know the size...HELP
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i'm guessing you have a 99 a4. if that's the case, the size is h7

 

thnx man...alotta ppl came by but no help
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You and me are in the same boat.lol This week Im planning on ordering mine.

 

This will tell you all your bulb sizes for your model and year. http://www.sylvania.com/ConsumerProd...lacementGuide/

and here is an interesting, non-professional comparison of HID bulbs done on a FJ cruiser forum. (scroll down till you see all the pictures)
http://www.fjcruiserforums.com/forum...-thread-8.html

Just a note about the comparison above, it is done with H4 blubs, and the high beams are on.