Wiring harness and 12V conversion

I need to replace the original 72 year old wiring in my C17. I will be having the work done in about a month.

I would like to know where I can find an OE wiring harness, or even if such a thing exists. Also, are there 12V headlight and taillight bulbs available for the 12V conversion?

Thanks.

I used R.I Wiring when I rewired my C-17. Terrific company, with excellent instructions. (I've also used their harnesses for a '52 Lincoln and a '29 Dodge) I kept my 6-volt intact, for the sake of originality. No problems with using six volt so far, though I only drive the car spring through autumn.