Thanks,
Andrew


If there is moisture between glass, then this isn't something you can fix by replacing the insulation. You will need to replace the glass entirely.
My recommendation is to contact a local glass shop to see if that's something that they can assist you with.
We sell a wide variety of sliding window rollers, but I can't say for sure if we sell this particular model. Would it be possible to see what it looks like removed and by itself? A lot of important details are obstructed in the current photo.
I also want to make it clear that there is a chance we don't sell this. These are old windows, and hardware for this kind of application can be difficult to come by. I will do my best, but I don't want to get your hopes up.
In the meantime, you can see our full selection of rollers here.