Description: Extension Tire Valve Stem for Audi, genuine OEM part number 3B0-601-373-A, also searched as 3B0601373A. Fitment note from the Audi catalog: Extension. 18. 19. Also known as Extension, Tire Valve Stem, Valve Stem Extension. This is the factory original component, not a reproduction or aftermarket alternative. Sold by Audi Henderson, an authorized Audi dealer serving Henderson and Las Vegas, NV, and covered by Audi's manufacturer warranty.