Leaf Spring Help

I attempted to Swap Out my Tired Early A Body Springs for the Super Stock ones...
Of coarse the 55 year old U-Bolts and Shackles didn't want to cooperate.
Should I go to Napa or similar for these parts?
or does anyone have the Rear Shackles and a Set of U-Bolts I could use?
I broke this stuff off of a '65 barracuda with Stock Springs,
U-Bolts are about 6 1/2" long and 3" center to center.
Thanks Fabo,
-eric

Shackle.jpg