bkdunha, I've checked what info I have as far as order guides, AMA reports, etc and cannot find any references as to what qualified a vehicle for the valve stem extensions. I don't recall ever seeing any on the standard wheel cover cars so was probably unique to the Sport wheel cover optioned Mustangs and Torinos. As with other "Loose" items placed in the trunk as the cars progressed down the assembly line, the extensions were not installed at the assembly plant. Loose items included floor mats, wheel cover/center caps, radio and antenna kits, and any other items that had a chance of being damaged, soiled, lost or stolen during its journey to the Dealership. All these items were installed at the dealer during the PDI (Pre-delivery/Inspection) process.
Until 1975 Ford used two different extensions (1/2" and 1 1/4") on the car line. Extensions sent with the vehicle in this manner would be in a bag identified by engineering number only and not the Ford service part number.
Has been a long while back, but I remember a friend with a Torino that had the Sport wheel covers with extensions. He figured they were NAPA parts and didn't give them a second thought. He got caught up in the Cragar S/S, Keystone wheel fever so the wheel covers didn't last long!
The illustration shows the Ford short 1/2" and the longer 1 1/4" in a bag marked "D4AA" which indicates it is from 1974 and was a assembly plant supplied part and not a standard Ford service part.
I know this response has probably not provided the answers you were looking for but hopefully has provided some insight as to what was available from Ford.
Perhaps the sources providing you feedback could offer some more verification. Would be interesting to see what additional info could be uncovered.
CODZ-1705-A 1/2" (pre 1973 versions were 7/8")
B7AZ-1705-A (replaced by "B") 1 1/4"