I was looking at the same thing for my 240z but will probably just get a Quaife lsd or this company do them as well http://members.optusnet.com.au/amaxeng/five10/diff.htm
Both dizzys I had were from an auto, (280zx and R30) so I'm not sure why the R30 auto doen't work in a manual, I did notice a big difference in the size of the vacuum advance unit though, the 280zx one was much bigger.
Thats okay John I have two already, just thought it would be easier to put a reco one in.
I thought you were looking for an auto dizzy though John, did the manual one work no problems?
I've got a brand new Nardi Deep Corn steering wheel for sale in black suede with red stiching 350mm, comes with horn button also, PM if interested.
$390
eastern suburbs Melbourne