This is for a new set of 1955-1956-1957 Chevrolet lower spark plug wire holders. Mounted to the engine block behind the exhaust manifolds, these shields protect the ignition wires from damaging engine heat. The ignition wires run through the rubber grommets, safely hidden behind the sheet metal shield. Fits all 1957 passenger cars and 1956-57 Corvettes as a correct reproduction, but also fits 1955-56 passenger cars as a good replacement. Sku#3315