Anyone know a part number or where I can get the black plugs that go into the early headlight assy that the adjusting hook goes into?
Need a picture of what your looking for.
Is it metal or plastic? If no one sells it and you have one of the parts already it should be easy to replicate nowadays. Find a maker space in your local area and contact them, they should be able to 3D print or laser cut the part and more importantly they'd be willing to help you if you barter a locally made six-pack of beer or cheese sandwich, etc.
Don't bother contacting a machine shop. You'll be wasting your time and theirs even inquiring about making a few doohickeys for an old Volkswagen.