Sorry. Got me wrong there. They make them in whatever length you need. If you are after Works Performance, probably the best way to do it is through a Maico dealer in The States. If they've got them (W/P's) before they should be able to get the spring rates right and all that bizzo. I get all my shocks and parts through my Montesa man in The States. If you're not too comfortable dealing with someone from so far away, you might be better going for a local brand that you know you'll be able to get your bits from no worrries. The only Works Performance distributor that I know of (this came from the company) is some Harley shop in Qld somewhere and they aren't into the dirt side.
Having said that, I'm more than happy with all of mine (3 sets) and have had no dramas.