I pressed the pulley off the Vacuum pump and there is a seal and O ring it cost me $5.00 dollars for the parts, shaft had slight groove from old seal but light linish and with the new seal (double lip) this fixed the pump.
Seal 20 ID x 30 OD x 7mm
O Ring 31mm x 1.5mm cheers Terry Fullerton - Australia
Terry Fullerton, February 2023