Hemmings catalog/magazine has alot of part cars, I found most of my trim on Ebay, you just have to be patient on Ebay, new stuff for Lincolns pops up every day, Mine was a 66 which is a little more common than your bodystyle so parts are easier to come by. Heres some other sites
http://www.lincolnlandinc.com/
http://www.lincolnpartsinternational.com/weather.htm