Case bolt and washer set. Note: Replacement parts for your Late or Early style Standard Hypercharger air cleaner. For the Early and Late Hypercharger all parts are identical, except the early style case halves and the butterfly shaft & bushings are different. The Late style uses bearings on the butterfly shafts, the early style uses bushings on the butterfly shaft. Note: Parts specific for ‘early style’ only Hyperchargers are no longer available.