Auto (aka Discount Auto). Note that the original NGK number for the NA has been replaced with a new number (don't recall). Find the correct number at Nissan dealer parts dept and then do the cost research. These plugs are about $10 each. Check gap to factory spec. These plugs come pre gapped but still need to check. Place some anti seize on the threads to prevent steel - alum future bind and blow out the plug recess before removing the plugs.