Need help locating a part
Apparently they were used in '60-'62 automatics because there was only a strainer in the pan.
See page 32 of this document:
http://www.plymouthbulletin.com/DVD-Plus/Issue294s.pdf
Unless you're using one of these trans then you don't need it. If you are, for some reason, then you can find generic inline trans filters from a number of sources (via a google search).
Oh, and stay away from the creeps.