Get brass fittings from the hardware store and make your own Z-block! A coupe of t-fittings, and elbow and some 1/8" NPT nipples, a drill press and tap for a lock screw (for the dial gauge)....and....voila!
Sears or other HW stores have dial gauges...
I wish I'd taken a piture of my "Souk-block"
Maybe when I get home tonight...
You can have your own set up for about $50...maybe