Hi all
I run a Go .21 3 port sport engine and I'm lost on glow plugs for it.

I've read here use an OS #8, but that's a short plug.
from Amainhobbies.com "Note that O.S. engine plugs are SHORT body plugs and should only be used in engines that require a short body plug. O.S. plugs should not be used in Novarossi, RB Concept and most other motors manufactured in Europe.
"
On Amainhobbies.com it says this for a #5 Go plug
"This is one Go Technology #5 Medium glow plug for engines that accept long shaft plugs (basically any engine except OS engines)"

Which one of the following should be okay to run as I'm on my last Go #5 plug.
McCoy #8
Novarossi "Standard" #6 Ultra Glow Plug
O'Donnell sport medium (purple) standard

By the way I finished 3rd in our Sportsman Buggy class this past weekend. This engine is tough to tune and ever changing even after 1 gal. I guess with alt at 3400ft above sea level.
My low speed needle is set at almost 3/4 turn out from flush.
I finally found my flame out issue. The high speed needle o-ring looked fine and no signs of an air leak from the needles, but since I looked at every possibility I changed it anyways and poof flame issue gone.

Thanks.