Just do a search on here on glow plugs and you'll find all sorts of stuff. Recently was discussed when Sonic Tronics had there Black Friday sale. They make the Glow Devil brand. I prefer the Glow Devil R/C long. Another favorite for a lot of people is the Thunderbolt long, R/C long, and their four stroke plug. They were not available for a while but I believe they have been brought back by someone. Your search should bring that up. For most stunt engines you want a hot range plug, especially for engines where you run a lot of oil.
Type at you later,
Dan McEntee