Moser Engineering Rear Ends?

Okay, so I do know that Danas came on Fords, and my if looked into right the f-250s? At this point, I havent pulled the trigger on anything yet and well if anything, i will just store the rear end in the garage for a future project or even this project. Cause parts around here are only going to get more expensive or not able to find.
So my real option in my area is hitting up the local u-pic-part yard. Which i have no problem with. I just want to know what i am looking for when i go in there. So any pointers on that?