yeoflagtrade sp546 spark plugs compatibile with ford expedition for f-150 f-250 super duty for f-350 super duty for lincoln mark lt for navigator, 5.4l 6.8l v8 v10 engine replacement for sp421 sp515 8 sp546 is up for auction in Automotive. This item is in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.