Because Kaiser-Frazer bought automatics from General Motors (the Hydra-Matic) K-F had to create a new flywheel to match the pattern needed for the Hydra-Matic. The existing flywheel for the 3-speed manual or overdrive version on the 226 was not the same as the H-D gearbox so Kaiser-Frazer had two different versions. The flywheels are not interchangable and neither are the starter motors for that reason. Char is right about the Bendix issue being the result of all this.
This is only on the 226; Henry J's never had HD but due to system load issues, if your HJ or Allstate is set up for Delco-Remy components, only the D-R starter should be used; if Auto-Lite, only the AL starter should be used.