Sorry but I don't remember what the thread size was on mine.

You can either make a glow plug adapter out of an old spark plug, or you can buy them for around 10 bucks or less from either Horizon Hobby or CH Igntions. You need a prop hub for use with electronic ignition. Another way is to take a hole saw and cut the center of the magneto out. You can then use this center piece, and a prop hub meant for use with a magneto. CH-Ignitions and others sell the prop hubs.

AV8TOR