LS Gen III Knock Sensor Relocation Brackets Billet Aluminum Compatible with GM LS Gen 3 Engines LS1 LM7 LR4 LQ4 LS6 L59 LQ9 LM4 551216-KN30. Relocates LS1 Gen III knock sensors from valley pan to side skirt of the engine block Made in Wichita, Kansas from aerospace grade, USA produced, billet aluminum Compatible with all LS gen III harnesses and gen III knock sensors Fits engine RPO codes: LS1 LM7 LR4 LQ4 LS6 L59 LQ9 LM4 L33 Includes 2 billet aluminum knock sensor brackets and mounting hardware. PLEASE MESSAGE US IF YOU HAVE ANY OTHER QUESTIONS, AND MANY THANKS FOR READING ALL OF THIS.