Hopefully this has not been reposted many times because I've used the search. I am trying to buy myself some HIDs for my fogs for my 99 A4 2.8Q. I wanted to know what size bulbs I should be buying for them and whether or not I should get replacement bulbs or the single beam HID kit. I am planning on buying from hidworld.com

 

I believe its a H7. Look on sylivania's website.

 

i saw somewhere that a4s use h3s..my a6 uses h7s