Transit diff in a Dellow

Those of you who know me will not be surprised to hear that I am looking for an alternative to the standard ford diff. The well tested fack diff are not avaliable at present. ( does anybody have one for sale? ) So i am building up infomation on splicing the ford transit diff to the crown wheel and pinion of the escort.I have detailed infomation on the work that is required.However can anybody tell me which transit diff is required? Has anybody got the correct parts for sale?

Trialling Down Under

Sporting Trials buffs might want to look at www.mudtrials.org and see how its done in Australia...................