is it possible to repair car windows?

[pan terrorizer (with OnlyPans!)]

If not, is there a mod that allows me to do so?

[Armagenesis]

You can only pluck windows from other cars in vanilla.
Try one of these otherwise:
https://steamcommunity.com/sharedfiles/filedetails/?id=2800412098
https://steamcommunity.com/sharedfiles/filedetails/?id=1801660269

[Shrub]

can uninstall windows from other cars and reinstall on your car.

[Jarzzen]

Originally posted by Shrub:

can uninstall windows from other cars and reinstall on your car.

This is the only option in vanilla.