I've not seen any replacement sheet metal for these trucks, but haven't really looked very hard. Running a welding shop helps....

This body style began in 48 and continued until 53. A 54 has enough changes that most things on the cab will not interchange. 54 started the curved windshield, and that changed again in mid 55, but before then, all the glass except the optional cab rear corners were flat glass and can be cut by a compident local glass cutter. The 54 and early 55 windshield is hard to locate and expensive, the late 55 & up is much more commonm and easily available, and much cheaper. 48-53 corner windows are the same and are available often on ebay. 54, 55, & 56 corner windows are also the same, but differ from the earlier trucks. 57 began the curved rear window. www.robertsmotorparts.com has all the glass rubber available (as well as others) and they also have window channels, and weatherstripping and several other parts for this era truck. They also know their parts and these trucks.

Pictured is a 54 Dodge pickup, notice the straight windshiels posts, compair to the windshield of my 50 (48-53) is 2 piece flat glass. The mid 55 & 56 have a dogleg in the windshield post and the glass wraps around the corner. The windshield is the easiest way to determine if the truck is a pre 54, or a late 55 & up. Gene