Since therfe was so much work done after these cars left Dearborn I believe they skipped the sound deadener application to the front wheel well (glad to be corrected if this in not right )
If there was no application in the wheel wells then there would be no way that overspray from that application to the front valance or bumper arms could have taken place
BTW undercoating was applied at dealerships - sound deadener was applied at the factory on cars