Get a drain / fill plug for the NV-3500 off a 95 Dakota V-8 and it will fit the NV-5600. My Dakota has a magnetic plug on both the fill and drain plugs, so I traded the fill plug with my NV-5600. I know there is a magnet in the bottom but it sure wont hurt to have two espscially because I like to see what the shavings look like at oil change time.