8.75 rear end for 73 Duster

I have a 74 Duster that is coming back from paint this Sat. I am getting ready to start the final resto work on it and need to start getting a A body 8.74 posi rear end for it. I do not want to spend the money for a complete rebuilt one but would be interested in one that I could get started with. I have a third member with a open diff so I can start with that. I would need a posi unit and the case and axles. I have Rally wheels on the car aready and need to have the large bolt pattern. ANYONE interested is selling one or parts?