Need Parking Lock Cover for 1965 Torqueflite Transmission.

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My 1965 Fury has this part cracked, as can be seen in the photo. It leaks fluid. My mechanic cannot seem to find a good one anywhere. It would be expensive for a machinest to fabricate such a part from new metal. Torqueflite transmissions were so common! Surely used ones should be available from somewhere from junked transmissions! Where can I get one?
Author: Henrius