Set of 4 1999-04 Audi A6 Sport Suspension Springs as removed from a 2004 A6 2.7 twin turbo with factory 1BE sport suspension and 150,000 miles on the odometer. Audi part #8D0411105FK front springs with 1 brown and 2 violet paint marks & #4B0511115BF.rear springs with 1 pink paint mark.  Springs do have some surface rust where the factory coating has come off but otherwise will work just fine.  These springs would work as a set on any 99-04 A6 with a 2.8 30valve or 2.7turbo V6 engine although they would slightly lower a standard suspension car. Probably not appropriate for a 4.2 V8 car.