If you don't have any luck locally you might try Dennis Carpenter (just type it in to the search engine). They make a lot of parts for the Ford guys. They have a pretty good catalog for the 48-52 Ford trucks. Some of the parts seem a little pricey and other are pretty reasonable.

It seems like when I was doing 51/52 Ford trucks thay had front drums. You might also keep an eye on E Bay (right now all thats seems to be on there are a pair of rears).