There's a couple (man and wife) that make harnesses and sell them. I had to troubleshoot a couple of their wires to get them right. The tail-light wires were reversed in their sockets on a few of the lights and in another friends, the 4 speed reverse light switch wires were in the wrong holesat the firewall, causing a fuse to blow when plugged in.
I don't know their company's name, but I think one of them is color blind.
Get them from Year-One
Rob