Unified Body wiring Harness on 2007 Dodge Caliber

I recently had a tire blow out on the highway and the thread from the tire broke out all of the plastic, stripped and tore up the wiring harness over the drivers side wheel well.the mechanic says the entire unified body wiring harness needs to be replaced, is it true it can only be ordered from the dealer? Also, what should be the estimated cost of labor, or number of hours? any do's, dont's or any advice in regards to this will be greatly appreciated. Thank you.

Asked by for the 2007 Dodge Caliber
Either way I hope you have insrurance coverage. Most of the time the wire harness is spliced and repaired. Its a time and material type repair that could only be estimated by someone that can see your car.