It all depends on what your expectations are. If you want the springs to last your lifetime, I would recommend buying new ones from Eaton. If you have a vehicle that you drive occasionally and just want it to stand up straight, you can re arch them cold by using a hydraulic press. 50 years ago, very few people bought springs for pickups. Labor was cheap and parts were expensive. Nearly all of the roads were rough and a cold re arch would last a couple of years of daily driving. Even though spring companies don't recommend it, all it costs is a new center bolt because they usually break and a little labor.
