Start with our forum's For Sale section. After that, put up an ad for the specific parts you are looking for. Keep up on the forum, and on your ad, there's always the possibility you'll get some bites. Lastly, on the open market, google "Obsolete Ford parts," and you will find a few places that have both NOS and used goodies. Green Sales Co., in Ohio, has microfiche sets from the dealer parts departments, so they should be able to at least help you find a part number, if not an actual part.
First remember that the station wagon is still mostly a car, so almost everything on the Galaxie of that year will work. things that are specific to a wagon are another matter, part for 3rd row seats, rear quarter glass, seals tailgate parts, brakes, drive train wheels, steering are all standard Ford Galaxie parts. If your looking for hard to find parts, post in the appropriate forum... Best I know, I am working on my 62 Country Sedan...