Is this something I can use in all my trainers?
http://www2.towerhobbies.com/cgi-bin...&I=LXJA89&P=ML

Or should I use something like these?
http://www2.towerhobbies.com/cgi-bin...&I=LXCB26&P=ML
And what is the “hot”?

Both say they “Work on All 2-Stroke Engines”

My engines (.25, .40, .46 & .32) are all 2-stroke and use short glow plugs.

Or should I get glow plugs specifically designed based on each of my individual engines?