Sources for OEM wire or Equivalent

I have not seen any threads anywhere so far that have sources of where to get OEM wire or equivelant as far as colors, colored wire with another color stripe, etc. I have rewired a lot of vehicles & always had to get scraps, old harnesses out of vehicles at the wrecking yards to keep everything copasetic as far as keeping all of the wiring types/colors as the vehicle originally came with.

Does anyone know of any suppliers?