1971 shock mount plate what size/thread of nut

[chargersb71]

Anybody know what size nut and thread cut I need on stud?  I might just need to clean up threads a little bit more not wanting to force a nut on there and ruin threads.  Besides waiting on ubolts and locating a hanger bolt this is all I need to reinstall rear end. 

[gtx6970]

The axle U-bolts or the lower shock mount stud ?

U-bolt = 1/2"x20 



Lower shock stud = is also a 1/2" x 20 just a shorter overall height

[chargersb71]

The lower shock mount stud.  Do they sell that as a kit? 
Never mind I searched your image thanks alot this forum is proving to be very valuable and very hard on the wallet.  With all the new sites I discover that I can get parts from.

[gtx6970]

U-Bolt nuts are $2 ea ( need 8 if replacing them all )

Rear lower shock hardware as shown is $15