Old Parts locating

My last unit was a 1988 Fleetwood. The door frame rotted from the bottom and had gotten loose. I shaved down pressure treated 2x2 lumber as the inside of the door was just under two inches in width and rebuilt it using deck screws and construction adhesive. You could not tell by looking at it that it had been worked on. Look at how it is constructed, mine was an inner panel, an outer panel and the frame material was aluminum channel with a groove for the interior and exterior fiberglass panels and had just enough room for the wood to fit and screws held it all together. I spent less than a day doing mine and did it by myself.