Man, I just took a harness out of a 90 scort last week. NOT EASY. The temptation to just cut something was too great. The junk yard is your best option. I think it was $25 for the whole harness where I went. Or you could call Ford and see if the have a way to get ahold of one. Expect to pay big for it though.
Chances are a junked car isn´t junked because of the wiring harness. The wiring harness is probably the best thing left on a junked car. The one I pulled off of the 90 scort was in great condition. granted there might be a couple of cars missing a connector or two, but there is bound to be one around theat is in good condition.