I would not go with Rhode Island wiring. I had very bad luck with them unless they have really improved.
I bought some bulk wire from Rhode Island Wiring and had no issues. I was looking for loom for the starter to ignition harness, but was told that they wind that on when building the harness and can't provide it separately. But they did have the original style braided jacket wire that I needed. Helpful and friendly on the phone.
They cover a ton of different vehicles, but are not cheap. Not sure anyone is cheap on reproduction harnesses.
