A few minor issues while chang'n the trans fluid today, so look'n for suggestions

The differences in the filter is typical for todays aftermarket parts. Correct for application as late as 2001 also works in 50 year earlier application so that's the only part they need to produce.
Some engineer somewhere determined that the second hole into the filter of earlier applications wasn't req'd. We accept that determination, "OK then" , "If you say so".