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Holley EFI Universal Coil On Near Plug Harness 57800BK including stock car GMC Sierra 1500 07 including stock car mandrel bent primary tubes (some models built using thicker 16 or 14 gauge tubing) Connects 558 312 or factory GM LSx coil harnesses The world's best street machine builders and tuners are making the switch to Holley EFI
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