I had springs made for my 52 1 ton with different ride height.
I used Eaton Detroit spring, they are very knowledgeable and helpfully. I would use them again over any other spring shop I have seen or know of. They even have the factory blueprints for most all original leaf springs, including our 1 ton trucks.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-