Acquired 94 Coachmen Catalina, Where Do I Find Parts

Hi Tracy, Welcome to the forum and congratulations on the motor home.

Very few parts are going to be specific to any specific RV. If you are talking about the side entry door, they are common in most RVs regardless of brand and purchased from a specific manufacturer and installed by Coachman. A quick search on eBay will likely find a suitable replacement based on size and whether it had square or radiused top corners. The same holds true for the windows, furnace, water heater and other systems.