I agree with Hot Rod John it's probably the original hood. I worked at Peterbilt back in the 70's and they did the same thing all the time. Material shortages led to early implementation of some components. Also if a press release showed a new feature like chrome headlight buckets or low mount door handles, customers would place a hold on their order until they got the latest version. That's not likely regarding your hood unless it was exchanged by the dealer. More likely they just ran out in production. Nice truck by the way.
