Holley HLY558-321 GM LS Coil Sub Harnesses

Holley HLY558-321 GM LS Coil Sub Harnesses is listed by Motorstate as a Ignition Wiring Harnesses for catalog matching by brand, part number, and product name. Use this source-backed listing when comparing Holley components in the Ignition Wiring Harnesses category. The manufacturer part reference is 558-321, while the Motorstate part number is HLY558-321. Catalog description context: Ignition Wiring Harness - Factory Replacement - Injector Sub Harness - GM LS-Series - Pair. No vehicle compatibility is stated here unless it is present in separate fitment data.