We have engine shaft oil seals available from PIAGGIO, PASCOLI and RMS. We here at SIP also compile some of the kits. We all rely on the supply of oil seals produced by either CORTECO, ROLF or other major engine oil seal manufacturers in order to put these kits together. Later PIAGGIO produced engines are provided with clutch side crankshaft oil sealing spring that are made of metal. The PASCOLI versions have an 'o' ring instead. This ensures that we have more than one set of oil seals available for every engine that belongs in a Vespa, which helps ease supply bottlenecks that can arise when dependant on an individual manufacturer. The Vehicle Identification Numbers (VIN) provide by PIAGGIO, PIAGGIO Vintage and PASCOLI do not always correspond with that of the specified oil seal necessary for certain earlier models of Vespa so check and compare the exact dimensions of the existing oil seals correspond with the ones to be ordered.
The rounded or squared recesses displayed in the design of the oil seals in earlier Vespa engines helps the cooling and lubrication of the adjacent bearings. The relative shape of the two designs is irrelevant as they are interchangeable.