Rags rags and more rags... I just took mine to a glass shop about the same thing while thinking I wanted a "artic style" windshield. Turns out you can pop the whole fold out frame and put in solid glass if you wish to.... no seals... just epoxy. I am going with AC and loads of electronics so sealing mine is a must... Otherwise its new gaskets, seals, and so on and still... rags rags rags. I didn't ask but a glass whop may have something more "high tech" these days as a modified replacement if you want to keep your fold outs... Might be worth looking into???
A word of caution... do NOT use silicone on them it will cause the frames to rust, if you decide to just seal them shut as some guys have buy the proper window sealer. Silicone by nature draws moisture, it was designed for use on glass but was never intended for use on steel or metals of any type.