Hi Guys i really want help for this issue !

I guess if you could post pictures of what you’ve got it might be helpful. Things like the firewall plug, the fuse box, under dash, and under hood harness, and what you’ve got to the tail lights and headlights right now. I would also go to my Mopar and I tint off the harnesses from ‘75 & ‘76. I like to use colored pencils to mark the leads on them to make it easier to identify what goes where when comparing two different sets of diagrams. I’m wondering if your duster is a Canadian model if it would have the same changes in the later US designated model. May be worth looking into.