I've been looking around at JC Whitney, and it appears that they have a few to choose from. I have no idea which one I should buy. I have a 1980 Fleetwood Brougham. Are there any other places around the web that I should look for a headliner?

http://www.jcwhitney.com/webapp/wcs/stores/servlet/Browse?storeId=10101&tf=Browse&N=111%2B200730756%2B1980%2B600011111&catalogId=10114

If you have installed headliners before, there are many places to buy them. If you have not, they are very inexpensive to have replaced at the trim shop. I would go this route.