Description: Genuine GM Ignition Coil, part number 19421259. This GM OEM ignition coil converts battery voltage into the high voltage needed to fire the spark plug. Made by General Motors to original equipment standards for correct fit, finish and durability—no guesswork with aftermarket parts. Verify fitment using your VIN or GM part number 19421259 before ordering. Shipped from Gateway Buick GMC, an authorized GM dealer.