This mounting kit is required to fit 17.5mm Dellorto carburettors with slot connectors to the original inlet manifold and carburetors with clamp fixation 24mm (use without the rubber). The kit contains: adapter, connector rubber, ring clips and screws. For Kymco SF10 engines (horizontal cylinder), the mounting flange is needed in addition, as this has a larger hole spacing. The metal connector has an internal diameter of 17.5mm. Dimensions of Rubber Connector: Inside Diameter: 23mm Outside Diameter: 40mm Length: 38mm