I have been going through my part manuals and retyping all the part numbers and information into an excel file. This will allow me to sort the list and see when changes were made or when parts where obsoleted.
Then I ran into the rear wheel and had to stop and study this for a while. The 7x 32 rim was marked as obsolete in Aug '39 and replaced with a 8x32 rim and goes back to 7x32 in 1949. It does not appear in any books after that. The 10x28 rims started out being an option,then in '49 they became 9x28 with the same part number as the 10x28.
The steel wheels that appear on war time 2N's do not appear until the 1949 parts catalog.
This is way to much fun LOL.