Worth a punt!? Could be a cheap LSD for someone...

might need a link?

http://cgi.ebay.co.uk/Ford-Rear-Diff-LSD_W0QQitemZ300088751556QQihZ020QQcategoryZ21654QQrdZ1QQcmdZViewItem

Try that one!

thought lsd diff codes where AA not just a single A

http://forum.fordsierraclub.co.uk/viewtopic.php?t=5843&highlight=diffs

according to that code and the pic it has to be a 7" 3.92 open ctr diff

so from a bog standard 2.0 DOHC maybe