Brand new Diff

Brand new diff on ebay

http://cgi.ebay.co.uk/ROVER-75-V8-MG...QQcmdZViewItem

They're also selling alternators at a good price but are they worth buying? Anyone had problems with these?

http://cgi.ebay.co.uk/ROVER-75-V8-MG...NATOR-BNIB-BIN

As its of Aussy origin what other cars was this fitted to or was it made to MG spes ?