They show up all the time
as NOS on eBay but I've not looked up to see which one you need and what else it might fit. I wouldn't be surprised to find that they are still available although I am only just recently getting back into Packards after being away from them (but still owning them) for many decades to know for sure.
That said, the Packard Parts look on my
Packard / IMPERIAL page has the breakdown of
each carburetor piece starting on page 202 (the same as in the physical book) so you might be able to find it there. However, it will require a free membership before being accessible.
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