CarBole Super Ignition Coil For 5.0L/5.7L/7.4L V8 4.3L V6 GMC,Buick,Cadillac,Chevy,Isuzu,Oldsmobile,Pontiac 1996-1999 1. Brand: CarBole 2. CarBoles coils will be 15% more energy than OE coils . 3. OEM: GM: D-577 , 10489421 ; ISUZU: 8-10489-4421-0. 4. Application: CarBole Super Ignition Coil For Buick , Cadillac , Chevy , GMC , Isuzu , Oldsmobile, Pontiac . 5. TS16960 quality control system certified .Wire & Epoxy : Imported from German Elektrisoal . Plastic : GE Valox resin .