the stanza sway bars no good but the 120y ones definitely worth grabbing. and the link pins too.
if the stanza has the girlock brake calipers, then these struts are a much better option to go for than the 120y, unless you plan on doing a rotor and caliper upgrade to the 120y ones down the track.
if you do go the stanza girlock struts be sure you grab everything from the top of the strut assembly right round to the lower control arm pivot bolt, even the rubber brake lines. from the 120y grab the castor rods if you're going to use the stanza setup.
the R30 skyline box comes out of an R30 skyline not sure of the years the R30 was in production for ??
for the tailshaft the splines and the yokes all vary so you may have trouble unless you've got your original one to chop up as well ......
hope this is a little help with some of your scavenging at the wreckers