100% NEW compatible aftermarket replacement part.FAST and FREE shipping by USPS Priority (domestic, 2 to 3 days).Designed to exceed OEM specifications. No modification necessary - plug-and-play installation! Fits left or right headlight.Includes LIFETIME warranty.Each purchase is for one (1) new aftermarket ballast.PLEASE NOTE! There are different types of ballasts for the Cadillac DTS model years listed. You MUST verify that the physical appearance of your ballast matches the one in the photo. The part number will say "1 307 329 115."WATER DAMAGE WARNING: Your headlight is most likely leaking. DTS headlights are known to fail and start leaking. This will destroy the replacement ballast. Over 99% of all returned ballasts are water damaged due to a bad headlight. Do not install on a leaking headlight. This ballast is exclusively designed for GenuineXenon to exceed OEM specifications while delivering a cost-effective alternative to the factory part. Built with high-quality surface mount and through-hole components from leading manufacturers. Compatible Part Numbers1 307 329 115 / 1 307 329 098 / 1 307 329 121 1 307 329 123 / 1 307 329 124 / 1 307 329 129 1 307 329 203 / 1 307 329 250 / 1 307 329 293 1 307 329 294 2006-2008 Cadillac DTS 2006-2009 Audi A4 / S4 Sedan and Wagon (w/o curve lghting)2007-2009AudiA4 / S4 / RS4 Cabrio (w/o curve lighting) 2006-2008 SAAB 9-7x 2007-2011 Volvo C302006-2011 Volvo C702004-2007 Volvo S402005-2007 Volvo V50 YOU PAY WHAT WE PAY FOR SHIPPINGThe price you see for shipping is the price we pay.Not a dollar more. We will gladly try to combine shipping whenever possible.NO PACKINGING OR HANDLING COSTBy using free boxes from USPS and collecting reused packing materials, we pass our savings onto you. Every dollar we save, you save.YOUR ITEM SHIPS SAME DAY*We buy things online, too, and know you want your purchase as soon as possible. We make an effort to get all packages out within the same business day if paid by 2PM Pacific Time.LOCAL PICKUPS WELCOMEIf you live near us and want the item fast, feel free to drop by and pickup in person! GUARANTEED TO WORKAll items are guaranteed to work. If not, we will make sure you get one that does.FAST AND EASY REFUNDSGetting a broken item sucks, so we want to make it easy for you to get a refund. Send us the defective part, and a replacement will be sent to you. If we can't replace it, you get a refund.