I recently bought a set of springs for my '51 Suburban from SDTrucksprings.com. I was very pleased with the quality, service, price and fast shipping. They claim the springs meet OEM specs. They were marked made in the USA.
Here is a link:
SDtrucksprings.com If I were you I would get all four springs. I put the front two on and made a test drive, then put the rear two on and a test drive. Major improvement in drivability with two and then with four.
Kurt
