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Amazon.com: ACANII - For 2013-2016 Audi A4 S4 Factory [HID/Xenon Non-AFS] Projedtor Headlight Headlamp Assembly Left Driver Side : Electronics
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GO-PARTS Replacement for 2009-2016 Audi A4 Quattro High Beam and Low Beam Headlight Bulb (Avant / Base / Cabriolet / Elite / Komfort / Luxury / Premium / Premium Plus) - Walmart.com
2000-2005 Audi A4 Headlight Replacement (via Headlight Assembly Removal) (2000, 2001, 2002, 2003, 2004, 2005) - iFixit Repair Guide
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Amazon.com: KarParts360 Compatible With Audi A4 / A4 Quattro Headlight Bulb 2002 03 04 05 06 07 2008 Driver OR Passenger Side | Single Piece | HID | D1S Bulb Type : Automotive
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Spyder Auto Audi A4 06-08 Projector Headlights - Halogen Model Only ( Will Not Fit Convertible ) - Light Tube - DRL - Black 5071842 - The Home Depot
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