[JChlupsa]

As Jason states below, Norwood cars had the "X" codes stamped on the Trim Tags. LOS cars did not, thus the reason it is harder to prove what the car was. A Z/28 as this one with the build sheet showing the VIN and the correct option codes for the Z/28 and the 15" wheels would show that YES its a Z. As for the odd ball codes on the tag in question, its a internal Plant tracking code yet to be determined how it breaks down.