no one makes patches to change a panel to a 'burb, nor would it be as simple as inserting the sheet metal window surround, there's a structure behind the skin, and fairly elaborate window assemblies
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics