If authenticity is not a concern, in addition to building your own another option is to buy a universal harness such ashttp://stores.ez2wire.com/-strse-37765/Oldsmobile-Pontiac-GMC-Buick/Detail.bok and modify or use what wires you need. Several have gone that route to save a bit. If you are keeping 6v, you need one rated as heavy duty. Those generally use larger gauge wire.
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