Oil filter - early cartridge style as used on 750/101/102 and 105 series 1300, 1600 & 1750 engines up to about 1972. See item code EN047 for the later style spin on oil filter used on 2000 engines and later 1300 & 1600 motors.
This filter comes with a rubber O-ring of approximately 90mm-92mm (O/D). Also comes with the smaller i/d sealing ring (smaller than the one fitted to 105 series cars) however the seal needs to be stretched to fit and is not easy to do in situ.