Dont know a part number but do know that the borgwarner has been exactly the same for many years. Apart from the obvious.
They came in many differnt ratios and and were basically either 25spline or 28spline.

Cars off the top of my head that have them-
Xf falcons (???splines)
Pintaras (25spline)
Skylines (not too sure but i believe 28)
VL commodore up to VS utes which still run a live rear end. Vl N/A were only 25spline whilst the turbo was 28spline and then from VN all the way to VS utes are 28spline.

Thats all i know. Dont know if the indepent rear centres are the same and dont know whats under the new tunners.

BTW. Coops my mate has a complete disc to disc 28spline LSD out of a VN he is willing to sell if your interested. Cheap as it has a bent axle tube. Good centre though.