Don't know whether anyone's seen these before, but I've just spotted some adjustable links for �34 which will suit the XTZ reviewed in RIDE this month. There are two types; one raises in increments from +5 to +40 and the other lowers...
http://www.projection-components.co.uk/quad-length-jack-up-links-select-model-975-p.asp
http://www.projection-components.co.uk/quad-length-lowering-links-select-model-978-p.asp