Is
this the sort of thing you want. It's a Bedford MW but gives some idea of the internal layout. I also saw another picture of a british FFW 15cwt somewhere on this forum I'm sure.
By the way - and being pedantic - Fitted
For Wireless does this necessarily mean fitted
with wireless, thought it only signified the necessary level of electrical surpression and some extra wireing. Cant see why you would go to that much trouble without fitting a wireless though.
Noel