GM Knock Sensor Grommet Seal for GM LS Series Engines, each, Part #12558177

This GM knock sensor grommet is an OEM replacement grommet for your GM knock sensors. It holds the bottom of the knock sensor onto the intake valley cover on all Gen III engines.  If you need new knock sensor grommets, make sure that you stick with genuine GM OEM replacements to ensure long-lasting performance and durability.

Sold individually. Also commonly known as an Ignition Knock (Detonation) Sensor Seal.