72 3/4 ton rear axle info needed

[RPOZ11]

Ok, some have seen my progress on the parts truck, here is where I am at with it:
Frame nearly stripped; will chem strip and Imron Black when it comes back.


Now on the Rear Axle:
I decided to re-use the 14-Bolt Corp Axle, just cause I already have it.
I am taking it in to be rebuilt/resealed, etc...

My questions are:
1:someone else did the shock brackets; what is the correct location for these based off of the pinion location for each side?
2:Where can I get replacement U-Bolts?
3: Where can I buy one 3/4 leaf spring? One side was broken!
I will post pics of what it currently has, and could someone assist me so I can correct them if need be!