Perhaps this vendor can help?
https://mykmlifestyle.com/ kmlifestyle@hotmail.com I had them build one for my '37 115C from scratch. No core to send them; got it a few weeks later, installed, perfect.
Not inexpensive, but worth it. Outstanding workmanship.
I've heard that '57 Ford sending units may work in your vintage of Packard but I'm not sure....
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