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Looking for leaf springs for a 1954 firedome 4 door Coronado
If yours are missing or your preference is to buy new and replace, I would recommend looking into Eaton Detroit Spring. They manufactured most of the leaf springs for our cars back in the day and have original specs to build accurate new ones: https://www.eatondetroitspring.com/
If you have your originals and they are not rusted or broken, they can also be re-arched. Usually, a good place to start searching for a business that will do that is either a Google search for leaf spring services in your area or somewhere that specializes in big truck work that may be able to at least refer you to a company that would do that kind of work.
Here is an alternate source for antique leaf springs: https://www.springsnthings.com/
I ordered and installed new leaf springs for my '55 FIredome from them. Everything fit well with hardware included. As I recall from several years ago, this company was less expensive than Eaton Detroit.