Where do I find a 1965 Lincoln Continental LF Door

Have you checked with any large salvage yard?

Most have access to a database with most other salvage yards for parts.

http://search..com/bin/search?fr=ybr_sbc&p=auto%20salvage%20parts%20database

do a Google search for classic car salvage yards there are lot is across the country also keep checking Ebay sometimes people are parting out cars, good luck.

l live in toronto ontario. in brighton ont. l know of a person with lots of parts for your year of car. contact me at mike7steeves.ca and l can check it out. describe what shape your car is in and tell me if you want a almost new door or 1 you can refinish. m.s there is also a warehouse in oakville west of toronto who has a extended amount of ford and mercury parts, body parts, part cars. good luck