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

Your replacement filter is the proper one.
The stone-old dirty 'thing' that came off it is the wrong one.

Running a 2-hole filter on a '65 or newer transmission means the trans has been drinking partially unfiltered oil through the 2nd hole (although it is clamped against the valvebody somewhat).
That figures, Ha! I was waiting for someone to comment on the condition of that thing! I was surprised too, that the oil/filter was so freek'n dirty. The thing has been sitting,(or at least feels like), for most of the time since the trans. & engine rebuild back in '80. feels like i only drove it 10,000 miles in the past 40 years. wrecked twice, once by me/another by hit and run (no insurance that covered my car), mechanical things sidelined it for years until divorce/move force me to get on it and deal with that issue. Retired now, and getting back into getting it street-able again.
Thank You for letting me know that this filter is correct!