Know the factory part number you are replacing? If it's listed below, this part will be a perfect match. If you can't find yours listed, try searching  website for your part number.

• Interchanges
  06H903017K, 06H903018E, 06H903018L, 06H903018M, 10174, 11106, 11706, 11706N, 477928, FGN20S036, PAC903018
  this is a tested used working alternator! valeo is the Genuine manufacture for this item, this alternator has the plastic end cover, just swap the end cover (just pry off)
  this is an upgrade alternator, 180 AMPS, 14 VDC single wire voltage regulator  
  this fits 
  Audi, Macan, VW with the 4 cylinder  2.0, and 1.8 engines 
  AUDI
  A4 13-16
  A5 -13-17
  A6 12-15
  B8 13-16
  Q5 13-17