70 duster question

The driver side harness plug is for the wipers. The other two are engine and forward lighting. I have a detailed video of factory underhood wiring here: http://70duster440.com/downloads.html (See video number 5).

Just about any donor a-body from the era will get you a working plug and harness. The only difference may be in the 2-speed or 3-speed wipers harnesses - which can be modified if necessary. I have an engine compartment diagram here: http://70duster440.com/EngineCompart70.PDF