I can tell you this...if you don't know what you are looking at, a 6 volt starter and a 12 volt starter look the same as far as the teeth go. I have been fooled several times and have had to guess because it is hard to tell the difference. Someone who works on starters all the time can tell immediately by looking. On the flywheels, you have 139 teeth (6 volt) and 168 teeth (12 volt). Your starter and flywheel shoud be 139 teeth and 6 volt, if you are stock.
You might already have this information, but thought it might be of some use.
Good luck!
Joe
