Not sure where to post this, but I need a quick answer, and since the part is off an S3, this is the best place to ask. Are standard S3 front calipers the same part as my B5 Passat(TDI PD115) front brake calipers? I'm using my S3's old 312mm caliper carriers on my Passat, so I know the calipers are the same dimensions and fit, but I remember reading there are two versions of the same caliper with different piston sizes? And before anyone tells me to go measure them, it's cold outside, and I need to take the caliper 'off' to measure on the Passat, so no point doing the same job twice, when I can get the answer on here first to make sure. Cheers.