C5 Corvette LS1 LS6 Magnetic Oil Drain Plug NEO Magnet Fits: All 97 through 04 Corvettes Designed to Fit All C5 97 through 04 Corvettes. Uses Neodymium (NEO) Magnet: Which is the Strongest Permanent Magnet Made. 5X Stronger then GM's Magnetic Drain Plug. Cheap added Engine Protection. Drain Plug size: Pilot Point M12-1.75, Head Size 13mm.