Welcome to AF!
The one "fault" with Roadmasters is their interior door panels. They crack very easily especially when you have to remove them to do repairs on the windows. Have you tried any of the online GM dealers for the clips? You may have to contact a few as one may still have the parts. If you are looking for door panels, good luck. They are extremely hard to find, especially in excellent condition. You could keep an eye on eBay,(ebay Motors under "Buick Roadmaster"). Another source for door panels is
www.car-part.com . I have a tan interior and am searching for the driver's side door panel . Mine has a good size crack running through the middle from attempting to remove it while fixing the window in the door,( it is tan also.)
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Thought for the Day… Alcohol does not make you fat - It makes you lean... against tables, chairs, floors, walls and ugly people.
If a prostitute here in America loses her job to a prostitute in India , is that considered "outwhoring"??-Jay Leno