New Stella owner here

Please pardon me if this seems like a silly question.
I am pretty sure that I need a new spark plug (starter tries it's darnedest, but the engine won't turn over).
I was browsing the forums and I noticed a lot of debate about the best spark plug to get, but.....
Can someone tell me if the NGK (7473) C8EH-9 Standard Spark Plug will work? I really need the part ASAP and I'm not sure I'll be able to get to a special scooter parts store during business hours today.
http://smile.amazon.com/NGK-C8EH-9-Stan ... al_qh_dp_t
I know the owner's manual lists this plug, but I saw someone else having a problem with a plug that the manual recommended (RG4HC - Champion). I wish I could get this at O'Reilly or Autozone, but they don't seem to have it

I am also going to try to clean the spark plug when I get home today, but having a spare on-hand wouldn't be a bad thing!
Thanks!