0 ohms is a bad glow plug...over 2 ohms is a bad glow plug....i wouldnt worry about the .1 or .2 difference in opinion......
i would never use a glow plug in a ford that wasnt made by buero... (thats also the company that makes them for motocraft). You can also get buero glow plugs from autozone..
i may have spelled buero wrong..
but at least you get the point as far as the name...