Tail Shaft Leak - was "Is this gasket available? A904 Extension Housing Snap Ring Cover"

Edit: After a closer look, it seems the trans fluid is coming through the tail shaft seal and dripping down. My understanding is that the tail shaft seal is really just a dust cover to keep dirt from going in, not meant to seal fluid. So if that's the case, what would cause this type of leak?

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I've got several transmission fluid leaks on my '74 Plymouth Scamp, /6 auto - and after cleaning things up, it appears one of them is the extension housing snap ring cover gasket. I'm having a heck of a time trying to find a part number or even the correct name for it. Does anyone know if this gasket is available? A part number or source for it would be amazing. Or do I need to make my own gasket for this?

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