For parts dealers the big two are Max Merritt and Kanter. When you have some time I would download their catalogs and look thru the relevant sections.
However there are also tons of assorted parts dealers around. I am even one, though I sell only one part, nylon to fix your front vent windows:
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=26177 Point is there are countless other parts dealers such as Tucson Packard, packardparts.org, Speedwell Garage, White Glove Collection... plus tens of people with parts cars that could pull some random part for you if you ask. Point is, it often pays to ask around if you need something that's not a normal consumable type of part.
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