ACDelco SS550 Packard Spark Plug Wire is a 7 mm silicone-insulated ignition lead with an orange jacket, sold in a 1 ft length. Identified in listings as SS550 and often associated with the 2Q89 designation, this wire is part of the Packard-style ignition-wire family and is commonly used as a short-length replacement for GM/Packard-era ignition systems that call for a 7 mm Packard-format lead. The silicone insulation and compact 7 mm conductor diameter are designed for direct spark delivery in tight engine bays, providing a simple, reliable path for the ignition signal in compatible applications.
