You can get the kits from the wholesale distributor here:http://www.perthwa.com.au/leanda/kline.html
or from Veales and Repco if you quote the supplier, maker and part number. But note after 3/93 builds the lifters are unrepairable.
VALVE LASH ADJUSTER REPAIR KIT
TO SUIT FORD FALCON EA-EB 1988-3/1993
12 RUBBER PISTON RETAINER CLIPS
12 RUBBER BALL SEAT RETAINER CLIPS"
$21:50 does the lot; a fiddly job but they have lasted so far in my NB.