Rear end question

[CarterD2015]

I need to identify the correct rear end from my 72 c10. My father talked me into using a ford rear end because it already has disc brakes and posi. He was the brains of the operation but he recently passed away and I have no idea how to finish the rear end swap. I still need to weld the pads to the axel tubes. I am concerned that if I do this incorrectly that the truck could track funny and or vibrate.

I considered my options and don't want to spend 3-4k on a new bolt in. So I decided on putting the original one back in. That way I can get the truck on the road and worry about upgrading later. The problem is I can't seem to locate it in his parts pile. I have included a pic of the one I think is it but need confirmation.

Thanks