[Joe K]

It won't matter where you get the headlight wiring kit (includes the bakelite disk with the "contacts." Everyone is selling the same thing.

The defects you'll find are that the "buttons" on the disk are not "dimpled" enough to really hold onto the switch spider. There may be a tendency to turn on your lights as you turn the steering wheel.

Another defect commonly noted is the "button ends" on the wires are a sort of el-cheapo pressed sheet metal affair - and don't hold especially well into the light bulb housings in the headlights. Most sellers sell the "turned wire ends" to replace these which are more like the original but require some wire soldering to cut off the pressed buttons and solder on the replacement turned buttons. So you'll be doing some radio/tv level soldering with rosin core solder (try to get 60-40 which is still available, but expensive.)

It is possible to get an "original" headlight wiring from Berts - but there is an element of "don't know exactly what you'll get" in that. Likely you'll have to replace the wires/ends anyway (cotton covered wire) and the wear situation of the bakelite plate might be indeterminate.

You've got my answer - but there may be others. Your best plan might be to open a new thread on the wiring harness and get other opinions.

Joe K