How to Identify front drums

[Techie79]

I have a 1958 GMC 3100 that I am in the process of rebuilding and need to figure out what the front wheel assemblies originally came off of. Some time prior to 1987 when the truck was parked someone replaced the original 6 lug hubs with 5 lug car drums with the 4.5 lug pattern. The only part numbers I can find on the assemblies is on the outer bearing and race. Thanks in advance for any suggestions or info.