for all you d-series guys here is a link to a real cusco 1-way LSD on ebay.
http://cgi.ebay.com/ebaymotors...=WDVW
the auction says b-series but if you look at the nukabe website the b-series model has a different part number designation.
i was looking at it for use in a b-series but now i'm convinced it's for d's only so i thought i would pass it on.