The dealers have the kits for $40 ktm one husaberg are more http://www.ktm-parts.com/80029099000.html
Spend the money at your local hardware store and get more and better tools. Lawn mower section has better plug wrench.
see the attached link, but try it first without shortening it. i made mine for a 450 and seem to recall it was iffy on my 650. viewtopic.php?f=1&t=7009&hilit=plug+wrench