4 pack of Iridium spark plugs for Chrysler engines 2 spark plugs each cylinder. 4 units 9403 spark plugs .

The oem spark plug 570 is copper electrodes. These are the iridium replacements. They last longer because the gap wont erode as fast as the copper design. These still have a copper filled nickel ground wire with an iridium pad welded to it. The center electrode is iridium .

Must verify fit for engine in champion catalog