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H.D. springs...yes. If it is listed in your glovebox, then you probably have them.
Helper springs.. Yes, they do not harm the ride in one bit. They don't even come into contacat untill you have 500 or so punds in the bed.
Air Bags, no, not stock. I would leave them in what ever springs you instal, that way you can run deflated as daily driving, and then inflate them when it is time for your truck to go play truck.
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