Just bought a 1958 F800 Tandem Dump. I don't know too much about it, really.
I'm curious where I might be able to find parts for this. Someone said there are three manufacturers that still make parts. Also, where can I find the engine serial number? Thanks.

 

Actually, just looked at the door plate and it says it is a F-862. I assume this is the factory tandem dump configuration. Where is a good place to find info about them, or where can I buy a shop/owner's manual?

 

As far as the shop manual, you might try Dennis Carpenter Reproductions. The 65 shop manual I bought covered the full truck line, including the 534 super duties. Carpenter and others found in a web search do carry asurprising amount of NOS (new old stock) parts.
Good luck