I have searched Penske, Maximillion and Real OEM and all show a belt for the York compressor for my 72 Bavaria but the description says "vacuum line" which makes no sense. My current belt is way too tight with compressor as close to flywheel as possible and I cannot read any measurements on it. I am thinking it should be 12.5 X 850 rather than the 12.5 X 800 listed for the Sanden compressor.