For my '48 Loadmaster 1.5ton I went with the "original' cloth style wiring harness w/turn signals from Jim Carter. I knew somethings would probably be different as they don't list a harness for my application. The main differences are; most of the '48 fuses are omitted (no more head light fuses)
The fuel sending unit wire is too short.
No courtesy light wire, or steering column horn wire
Other then that it looks and works great for me.
It is $500 as opposed to $750 & $950 I was quoted from some of the popular "wire harness" vendors here.
I think the quality is great, the instructions were ok. I laid the new wires out and studied them with the instructions before removing the old harness.
I think the removal/install/trouble shooting probably took me 6-8 hours all together, I broke it up in to three or four sessions.