ARE shell pop out window swap

I have an older ARE shell and was wondering how hard or how expensive a side pop out window conversion would be. I have a short bed. I had one on another truck and it was great. Kind of miss having that. ARE said that my shell was to old and told me there was nothing I could do. Yet it has common slide widow sides. There has to be a way to swap them out without buying a whole new shell.

 

I don't know about ARE but when I bought my SnugTop they said the windoors were slightly smaller so I couldn't have them installed later.

I suppose it's still possible but it could be costly so buying a used shell would be cheaper.