AudiQ5research
Parts:
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Discount Auto Parts Online — PartsGeek.com — Domestic & Import Auto Parts Warehouse (had OEM fog light replacements, and generic alternative, good price)
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Audi Parts | Volkswagen (VW) Parts | Porsche Parts | Sprinter Parts (linked from the forums, had a generic part, didn't search further)
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Shop Audi Genuine Parts and Accessories (place to look up official specs)
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RockAuto (enthusiastically recommended on the forum, OEM and generic parts, lowest price)
Replacing the passenger fog light socket, part #8T0941700B (TYC generic is OK)
Tires
http://www.tirerack.com/tires/tires.jsp?tireMake=Goodyear&tireModel=Eagle+LS-2&partnum=355HR9ELS2