Our bus doors had broken glass and they were rusty. We found
a new set with zero rust and perfect glass in a salvage yard.
We had the windshield glass replaced by a RV glass company, When he was doing that he said he could do the doors as well, but by then we have the replacement door, we just had not installed them yet.
But our glass was not double pane, just regular auto glass.
https://thebusabides.com/upgrades/shut-the-front-door/