My 68 wiring harness was beyond repair. There are no reproduction harnesses for the 68 and even if they did make one for it the 67 harness was right around $500 from Mustangs Unlimited. I contacted "Metro Mustang" and got a used original one in mint condition for $250 (cheapest I could find). Their web site, along with phone #, is
www.metromustang.com. If interested in contacting them, ask for Tim. He's been a great help to me and can get you just about any possible part you'd ever need.