Audi A-4 2.0L (05-08) Coolant Line Pipe to Thermostat REIN Water Hose - Coolant Pipe to Thermostat Audi part# 06F 121 057 D, check fit below. Recently made by REIN AUTOMOTIVE, not been lying around. Fits: (2005-2008): A4 2.0L Fits: (2005-2008): A4 Quattro 2.0L