I wonder if there is a reason for the 2 diameters, different position of the shift fork or something?... maybe they needed different ID for not mixing chief and scout parts.
If you can't find the correct one, I will check my box of stash. I sold of most of my 3 speed chief transmission stuff, to finance a 4 speed OD. However, I still may have a spare shift fork for my sport scout..
1944 Indian Chief + sidecar
1939/40 Sport scout bobber,