[djb]

I have a 2007 DJ2, however it's only 80mm and 100mm would suit my frame better.
Are they internally adjustable somehow?
The shop I went to was pretty useless, and basically told me to buy a new fork.

 

[w00dy]

I'm pretty sure you need a spring kit do to that. Ask a different shop or call Marz direct.

 

[BikeMike]

If you have a spacer with the negative travel spring, you could pull it out, but you'd still need a longer main spring. If you're really light, you might get by with air preload only, but don't go over 50psi, and unless you can run air in both legs and you don't weigh much it's not really going to work.