Need bench seat springs for 1976 C-20

[Henry]

Hi Guys:
I need 5 or 6 seat springs for a 76 Chevy C-20 Custom Deluxe bench seat bottom. Probably the same for C-10s and C-30s of the same year. Since these are not typically sitting around loose, I would also be looking for the entire seat frame even if it is in bad shape. My style of springs have the rectangular bends in them and you can see what they look like in the attached photo. Any leads would be appreciated.
Regards,
Henry