PN for that bulb holder is 893941669. Used throughout the C4 line plus B3 and B4 Audis and coupe quattros. Think wrecking yards. Still in the Audi parts system for the C4 98 A6 avants. Pricy (item 3) http://genuineaudiparts.com/parts/1998/Audi/A6%20Quattro/Avant?siteid=214407&vehicleid=192376&diagram=1350150&diagramCallOut=3