buying spark plugs, do I need 5/8"-24?

[rbridges]

are these the right size plugs for my C model?

http://www.chiefaircraft.com/catalogsearch/result/?q=UREM37BY

did some research, and it looks right, but I thought I'd make sure with you guys.

[rbridges]

nevermind, I found that I ordered REM40E in the past, so it's 5/8-24.

[Raptor05121]

Good to know, I didn't know mine

 

[MB65E]

FYI- The picture on chief is not a BY plug. I like the REM37BY's in mine!!

In the future, I might mix mine up a bit and put a fine wire on the top to possibly smooth the spark out. It was recommended by the guy that dynamically balanced the engine/propeller. 

-Matt