I know that there is a company that supplies new wire harness's to the restoration supply companies, but I don't know if they make the one that you need. There policy is that if they have the original wire diagram from GM, they will make it. If not, you are out of luck. They will not make a copy of what you have. If you can't find a new replacement, then possibly Ed might be able to get one off of a car when he goes to the junk (recycling) yard. I know that the front harness is an easy one to remove, since it is connected to the passenger compartment wire harness at the firewall under the brake booster by a 3/8" bolt into the fuse block. Most times that wire harness's fail, it is because they come in contact with the exhaust manifold, or they rub through because they are not properly secured as they left the factory.