66 valiant rearend question

[70mopardad]

ok heres the deal my 66 valiant has a bunch of broken leaf springs and i am going to rebuild them the main leafs are ok ,what size are the center bolts that hold the leaf pack together? i want to have everything lined up before i rip it apart. thanks

 

[66MOPAR77]

I can't remember the size of the center bolt, a 1/2 socket will fit the nut.
I rebuilt mine with a set if Durango leaf springs and added the same thickness of springs that I took out and it gave me 2" more height