Does LMC carry the parts? My only idea, I'm sure most if not all the parts are disco'd by GM.
I too converted from sliders. The hassle of the loose wing window, bad seals/weatherstripping and unavailability of parts (not to mention the tiny metal screws that hold the wing window assemblies together bonding to the aluminum) at the time made my mind up for me.
Instead, I replaced all the topper seals, devised a way to remove the top without killing myself, and now just remove it if I want to use the truck and the weather is nice.
The sliders probably wouldn't be bad if you were able to replace every piece on them.