Hi - newbie here - I have a 66 Coronet 9 pass. Also just sold a 76 Olds and 84 LTD. Wagons are he bomb. urrently searching for good 50's wagon with fins. Hopefully can meet some good people here.
Welcome six-t-five! A 50's Ford, huh. I'd look in the Mid-west prairies. Lots of them in North and South Dakota, or down in Arizona or there abouts. http://www.dvap.com/ For the Prairies, you want to look at something like the Autotrader or maybe Craigslist by large and small community. The farmers usually try to stay local when selling stuff. A road trip is the best though, through the small towns and old dealerships. Yes, they still sell old iron in the 'very used car lots' out here.
Looking forward to seeing pics of your Coronet. Meanwhile, heres a link to a 57 Plymouth wagon on Craigslist with fins. http://detroit.craigslist.org/mcb/cto/1595110874.html