Upper rear spring cups, reproductions?

[71C10SWB]

Hey guys,
I'm new to the board. I just brought home my new '71 swb last weekend and I need to get rear coils on it. When I got it, the rear coils were removed and it was sitting on the overloads. I need to know if you can buy the upper cup that the coils fit into. The ones that are on it are rusted beyond recognition. I could build some, if needed. I have a set of coils and I still need to order the lower clamp plates, so if I could get the upper cups at the same ime, it would speed up the process.

Thanks,
Brent