Before 1969, Fisher Body was actually a separate division from Chevrolet. Even though the two divisions were often under one roof, they were separate operations. When orders would come in from a dealer, the order data was programmed into computers and the computers would then create either a BODY BROADCAST COPY, CHASSIS BROADCAST COPY, or what we commonly call a "build sheet" with the pertinent data to assemble the car. In 1969 the two divisions "merged" into one entity, the General Motors Assembly Division, or GMAD and policies and procedures changed to a centralized tracking system.

Prior to the 1969 model year, the Fremont, CA. plant and the Framingham, MA. plant were the only two plants known to use a single document, commonly called a "build sheet' where other plants would break up the assembly information into a BODY BROADCAST COPY for Fisher Body and a CHASSIS BROADCAST COPY for the final assembly side of the plant. Each division had its own "need-to-know" information about the car.

The Atlanta, GA. assembly plant continued to use the separate BODY BROADCAST COPY and CHASSIS BROADCAST COPY sheets (or PASSENGER CAR SHIPPING ORDER) in 1969 before adopting the single copy "build sheet" in 1970.

The Baltimore and Kansas City assembly plants used both the BODY/CHASSIS BROADCAST COPY sheets in 1969 before transitioning to the single copy "build sheet." By the 1970 model year, all assembly plants were using the single copy "build sheet" with the exception of the Flint, MI. assembly plant who continued with the BODY/CHASSIS BROADCAST COPY sheet.

The origins of the body number found on the Fisher Body Number Plate (aka, trim tag, cowl tag, Et al.) varied from plant to plant. Body numbers were typically assigned by GM from a pool of numbers for each plant.

Arlington:  The body number on the trim tag is found on the build sheet as the BODY NUMBER in block #8 of the build sheet and appears to have no logical sequence.
Atlanta: For 1970 the body number on the trim tag is found on the build sheet as the BODY NUMBER in block #8 of the build sheet and are fairly sequential.
Baltimore: The body number on the trim tag is actually a portion of the GM-assigned pool of numbers found in block #24 of the build sheet and NOT the number from the BODY NUMBER block #8 of the build sheet. The body numbers shown in block #8 have no logical sequence.

Kansas City: The body number on the trim tag is actually a portion of the GM-assigned pool of numbers found in block #24 of the build sheet and this same number is shown as the BODY NUMBER block #8 of the build sheet.

Van Nuys: The body number on the trim tag is found on the build sheet as the BODY NUMBER in block #8 of the build sheet and appears to have no logical sequence.