My mechanic that is rebuilding the transmission has been getting a rear engine seal that is measuring 4"ID and he's measuring the crank seal that's on the engine (see photo ) and it's measuring 4 1/2" ID. He's gotten two seals, one from a Dealer and one from Specter OR and there the same. It's not leaking that much so if we can't figure out what to do I just have him finish the Trans and put it back together. Any incites out there?