Subject: Expansion tank OE number: 4A0121403 NOTE! The above numbers are the numbers of original parts for which the item in this offer is a replacement. Before purchasing, you must compare them with the number of the original part being replaced. If they differ by even one character, this part will not fit or will not work or will not work correctly. In such a case, do not buy it. Car: Audi 100 C4, production year: 1991-1994 Audi A6 C4, production year: 1994-1997 Manufacturer: replacement Technical condition: The item is factory NEW, unused, undamaged, and unimpaired.