Online radiator source for S6 (I6) with AC

Go with the US Radiator for brass stock or the Champion for aluminum. Places like Rock Auto (not knocking them just the rads) Autozone and others sell Chinese made Rads that do not cool as well and are not exact fit. I ordered a heavy duty rad from Rock Auto and could only use 3 mounting holes for the fan shroud and the top tank was forward a little and had to use spacers on the top rad bracket mounting holes so the tank would not hit the core support.