As in title a mate just bought a 2004 fazer6 600 & as he is quite short it needs lowering.
It is the model where the shock connects straight to the swingarm .
I have a replacement for the section at the bottom of the shock which is (I think) 25mm shorter than the standard version.
I bought it a few years ago to lower my FZ6, but never got around to fitting it, so I could let you have it if you want.
Drop me a PM if you're interested.