What glow plug to use ?

[Blacky]

Hi I'm really new to nitro trucks just getting started and hope someone can help me a little. I bought a used duratrax warhead evo and need to get some spare glow plugs went to the local hobby shop and they sold me ODonnell odo 99 plugs and they are a little longer than what is in it now. And I have no idea what is in it now or if its even the right one I dont want to damage the engine its a 4.4 g-27cs.
Thanks

 

[ohmygahitscoby]

McCoy MC-59 would be your best choice.

 

[Mattyfats420]

i use a McCoy MC-59 and OS-8's they both work really well

 

[BOUTCH]

OS num 8 i use in my OS.30vg engine and work good