Is there something wrong with the one in the photo? If it's turned the wrong way in the offset hole in the extension housing, it might not be getting engaged with the spiral gear teeth on the output shaft. Try contacting FATSCO transmission parts. They've been my "go to" source for Hydra-matic parts for close to 40 years.
"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!