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VW and Audi use the same part system as Seat and Skoda - ETKA. The part numbering system can tell you what model a part is for and what type of part it is. The nice thing about VAG (volkswagen auto group) parts is that they print or stamp the part number on pretty much all parts except for hardware like bolts and nuts. This article shows more of how it works:
http://www.myturbodiesel.com/1000q/VWAudiPartNumbers.htm
http://www.myturbodiesel.com/1000q/VWAudiPartNumbers.htm