Rear Leaf Spring Help Needed

[RustMaster87]

My father is working on a 1971 Chevy 1/2 LB 2WD. He has the G70-G50 heavy rear spring option listed on his glovebox. The springs are broke on both sides from the previous owner and we can not find replacements anywhere. He measured them, mounted on the truck, and he said they are 52'' long by 2 1/4'' wide, with 5 leafs. Will 1980s style trucks leaf springs work on his truck? Any options on what we could use as a direct bolt on or how to repair these? Finding parts for 67-72 trucks is not easy in the Northeast as it is for my 80s project.. Any help on this would be greatly appreciated.