http://cgi.ebay.com/ebaymotors/Subaru-Datsun-Nissan-Hitachi-R180-LSD-DIFFERENTIAL_W0QQitemZ140173794260QQihZ004QQcategoryZ33731QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

My understanding is this:

The Subaru CV shafts have a different spline count than the stub shafts that come in a Datsun. So the only real way to use this diff in a Datsun would be to use the Subaru CV shafts. The issue there is length (guessing, but I'd think that they're too long) and they don't bolt up to the companion flange at the wheel. So you could do it, but might require a custom machined adapter for the wheel end and possibly a custom length shaft for the center. Big bucks...

There should be a lot more Subaru diffs coming on the market as the cars start to get older, so I would hope that at some point somebody like Arizona Z Car or Modern Motorsports would come up with a kit to adapt these in.

Not enough info to risk that money for it. I understand that Subaru has parts to fit Datsun, Nissan and many other Applications but who wants to spend 100.00 bucks just to find out its not the right model or year.