Kits include all of the necessary components to repair a carburetor, OEM jet sizes are included in the kit. NBR rubber material is used on all O-rings and rubber gaskets NBR has excellent resistance to the ethanol used in today??s fuels. Applications that use paper float bowl gaskets are upgraded to High Performance Interface Gasket material. Components included in the kits are based off of US models and discretion must be used when attempting to install the kit on a non US model.