The Model 48 was a big success in its debut year. Nearly 820,000 of these cars were sold, helping Ford to beat Chevy for the sales crown. Its success was in large part due to its price and looks.
Featuring a 221 cubic inch flathead V8, this car could move during its day. It was also given some major cosmetic changes each year, until a major redesign of the car in 1941. Even expert car guys might have trouble trying to figure out exactly where the Model 48 ends and the successor begins. 1937 is the common answer, but it can be argued that there is no good reason not to consider it a 48.
If you can find one of these, consider yourself lucky. Your best bet is to moniter eBay like a hawk. That's also where you're most likely to find parts. Those things don't just turn up at your local auto parts store.