The tooth damage shown in one of those pics is typical of a 6V/12V mismatch. Yes, you're measuring in the right place. PLEASE stop buying starters until I can get out to the shop and send you a picture of a correct one! Once an electrical part has been installed, it cannot be returned.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!