-Mounts to the bottom of valley cover.-Pair of new knock sensor grommets for gen 3 LS based engines1 Pair LS Knock Sensor Grommets Valley Pan Seal LS1 LQ4 LQ9 4.8L 5.3L 5.7L 6.0L Pair of new knock sensor grommets for gen 3 LS based engines Mounts to ..