opium , you forgot to mention some things...
Vlsd from 240sx se w/super hicas is direct bolt in.
300zx n/a is not. the axle shafts have to be changed out.
this is because the 240sx bolt pattern is 3-2 bolt sets, as where the 300zx is a 5-bolt pattern.
the shafts go for about $150 ea., from the dealer.
the Infinity j30 95+ is direct bolt up. it has the 3 sets of 2 bolt flanges.
earlier i believe needs modifications..
92-94 had diff bolt patterns.
vlsd from jdm 180sx is direct bolt in.
http://www.ka24development.com/vlsd.html