Affirmative... need either a Lucas or Delco starter CW rotation. The correct Delco will bolt up without spacer (but with slight clearance grind of its mounting cone)... some of the Lucas units used a thin spacer, uncertain on the single cylinder model Lucas though. A third option was a Prestolite starter, but I have not seen any available (except used) in a very long time. Bear in mind also, that the SR may have the starter boss in the housing but won't necessarily be fitted with the flywheel ring gear. Take a look inside to confirm.
dieselgman