1967 Dart differential question

why would you sell the rear out of it? if it is 7 1/4 with big bolt pattern I would be interested in the axels and the brake hardware with backing plates and drums but prolly not for that price

Its off of a parts car, and i have no need for it. the Diff in my Dart that im building has a good rear end, and not really looking to change it if its original..
I have no idea what any of these parts are worth,