Don't think that'll work on yours mate - From what I remember the first Gen FZ6 had a direct shock from frame to swingarm,
Why you wanting it anyway?
Try raising the forks through the yolks first by 10mm. Be aware that dropping front and rear will reduce your cornering clearance.
Other option is to try lowering the seat by removing the foam and adding gel in its place.
As far as I can measure it, it appears to be about 740mm from the top of the yoke to the centre of the front wheel. Does anyone know if this is the standard measurement?