Engine compartment wiring harness

Hello my A Body friends,
I know this is not the site to ask this question, but need to know if anyone out there in the Mopar world can help me out.

My brother-in-law has a 79 Lil' Red Express (owned for over 33 years) which is desperate need for a new engine compartment wiring harness.

Does anyone know where he can purchase this harness; M & H doesn't do the Dodge trucks.
Which is too bad because their harness for my Duster was perfect.

Your help/guidance is very appreciated.
Jack