Try this:
https://www.steelerubber.com/restoration-parts

Also looks like you have a modern shock absorber attached? Get the original shock rebuilt and you should not need?

Are you looking for a fixer, or one that is ready to go?
Thanks Todd

If you get to Las Vegas, have a 1952 Mayfair.

Copy of my 1939 5 passenger sedan plate.

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Switch

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These are on my 1940 Super.

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Wishing you the best. Have been looking about twenty years for one for me.

If you have modern tires in there you might need to deflate about half way, to make them skinnier. I keep a foot pump in the trunk for re inflation. Makes taking the cover off so much easier.

www.MaxwellEnamels.com
Just got mine back from Karla Maxwell, fantastic job, but it will take a few months more or less, as she seems to have had plenty of work.

Make sure you do not rotate the driveshaft. If you do the pawl inside the overdrive may not fall into place. I am sure someone will be able to attach a photo and use of proper description of what I am talking about. If you have rotated the drive shaft, you will need to push in with your little finger or a rod, the pawl making sure it goes into the indentation on the gear, and then pull back out so you can attach the solenoid again properly. If the pawl is not in proper alignment will cause war page of the adapter plate you mentioned previously as the solenoid tries to push into engagement. Even without touching anything, you might want to check pawl engagement anyway.
On my super have done this a number of times, but not recently, and am too lazy to get the manual for proper name of parts.
Make sure you do not overfill your overdrive or transmission.