Wow amazing work wobatt, i didn't realize that there were so many unused rims ingame, Maybe you should open a new SRTT Mod thread with your Rim modI noticed these too.
Rims are listed in externalized_vehicle_components.xtbl
These can be added to Rim Jobs by adding them to the groups in vehicle_wheel_groups.xtbl
I have no idea why they weren't included to begin with, as they all have complete models, and some have individual names.
Attached is the updated file with all rims included, just put it in your game folder as normal.