E36 320i Diff for sale and need bush to be replaced

Hi. My car, an e36 320I, was misdiagnosed as requiring the diff to be replaced. I did the job and bought a second hand diff for R2200 only to be told that the diff bush was the problem. I am now needing to sell the extra diff I had and have bought the bush but people want to charge an arm and a leg to replace it. Please let me know if anyone is interested in buying the diff. I have the receipt as well.

Thanks