If the chassis is a F-53, it is a Ford with leaf springs front and rear. There are 2 types of helper springs like you mentioned. There are Timbres and Sumo, and both have a lifetime warranty. I do not recall if this is only for the original owner or not, but checking with the manufactures will get you a answer. Why do you think they need to be replaced?
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2004 Flair 33R, 336 watts solar, Dometic Sidewise frig. Pan hard bars, front and rear, CHF, Timbrens front and rear, Roadmaster reflex steering dampener. Doug Thorley Tri-y headers, Ultra RV tune.
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