If you want to spend lotsa dough, Roush in Livonia MI can make new drums that are real nice. They are just the drums, you have to use your own hubs.
Jonny, They are the same width as the later milktruck wheels, 3.89" I think. They were also used on Milktrucks and light duty delivery trucks. They are rare because they were an option for trucks that needed higher clearance for rural areas and muddy roads, so not many were ordered.