A friend of mine owns a spring shop and he told me that it is best to use the original springs (if possible) because they were made better "back in the day" when they used to quench the steel in Cyanide. He added 1 leaf to my pack for the added HP and a 1/2 leaf on the front as an anti-wrap spring, then he de-arched them 2 inches. I sanded them down ( they wern't as rusty as yours) then primed and painted satin black, they look like new.