Complete wiring harness for Hotrods or my D-100

I don't know why you need Mopar, other than something like the turn signal switch, and you can cut that off and put something else on there. Some universal harnesses come with such connectors

Also the connectors you need can likely be rebuilt. EG on the A bodies such connectors as ignition swtich, headlight, wipers, dimmer, etc, are all plastic bodies and use what are called "Packard 56" terminals. You can buy them and crimp/ solder to your new universal harness

Just make sure the darn thing has enough wire to reach the tail lights!!!

Another thing, some more modern relay/ power distro boxes can be used to advantage. I bought two Jeep ones, tore them down, and intermixed parts to get more relays in one box.