I've never heard of a starter drive that will convert a CJ-2A starter to operate with a 124 tooth ring gear. You could always change the CJ-3A ring gear to 97 teeth, but that's a real project. If you were going to take the time to change the ring gear it may be better to go with the late CJ-3A ring gear with 129 teeth and use the late CJ-3A key start starter. (Edit - forgot, the late starter will also require a different bellhousing too.) A Henry J starter would be the easiest solution but they are difficult to locate. I have seen the stock CJ-3A "kick start" starters modified to key start by adding a universal conversion solenoid that bolts onto the top of the starter. Unfortunately I do not have a source for the conversion solenoids.
