here we go again.......here is the link to the Tower plug,
http://www2.towerhobbies.com/cgi-bin...p?&I=LXJA89&P=

and yes, i had to buy one to find out it is a short, as is the OS#8.
when an engine head is set up for "long" reach plugs, it is pointless to use "short" reach plugs.