There is only one leaf spring plant in the Chrysler corporate system. It's in Mexico. They've made all the leaf springs for Chrysler since the '90s, both OE and MP.

Before that, there was another corporate leaf spring plant, and guess what? It was not located in the USA either.

I hope nobody is pining away for the good old days when all the musclecar leaf springs were made in USA....because those days never existed.

Wasn't it Muddy Waters who said "you can't miss what you ain't got, and you can't lose what you never had"?

These are 454/455 3800LB super stock springs.
I would recommend the same for the OP's '67.