Ralf : You are correct. Obviously, someone is confusing "stamping numbers" with Part Numbers. I have attached a copy of pages from the 1967 "only" Parts and Accessories Catalog (single year MPC if you will), printed in January of 1967, and a page from the 1960-68 MPC printed in 1968, showing "Starter Applications". As you can see, both show the C7AF-11001-B stamping number, and the C20Z-11002-A Part Number. Also note that the same Part Number could also have a stamping of C40F-11001-A.
Hope this helps straighten things out.
Bob