Also, how does the build date on the Body Tag correlate to the Billing date from GM? How long did it take to put the entire car together?
The Fisher Body Unit Number found on the Firewall Trim Tag was unique to each assay plant and was not a sequential number nor was it sequential with the VIN or any other number or build-date information. The Unit Number was an internal Fisher Body Number used for sequencing the build of a vehicle relative to certain production factors such as color, model, options, etc. Once the order was placed by a dealership, PMD routed this to the Plant for scheduling by the Broadcast Dept. That particular order was assigned for build according to the above factors and not necessarily in the order it was received. If the same dealership ordered 2 different Firebirds on the same day, one a 6cyl verdoro green coupe and the other a Ram Air I black conv, chances are the coupe would be sequenced for build first. Both may have similar VINs but the Body Unit Number could vary quite a bit. Here’s an example: VIN- 164250 Body Unit No.- 4886 VIN- 164279 Body Unit No.- 7679 The Build Date on the Trim Tag was
