Oh, as a footnote, I ordered the bushings for the rear leaf springs and shackles today. The cheapest price I could find from the known Packard suppliers seemed to be $10 a piece, which is a lot when you need 12 to repair both sides. I figured I could do better, so I went and did some research.
I pulled the bushings from the shackle and the front of the spring, and they're both marked as Harris 60889. I didn't find any online, or on a cross-reference, but I found a list of Harris Bushings on several truck sites.
My thinking was that HB889 might be close to the 60889, so I confirmed their measurements with the ones I took from the bearing in my grubby fist, and found they were within 1/16" of what I came up with (and upon remeasuring, their measurement is likely the correct one.)
So instead of ordering 12 bushings from our known suppliers at $10 a pop for a total of $120 + shipping, the best price I ended up with was
http://www.truckspring.com, at $1.01/ea. Shipping was more expensive than the cost of all the bushings together, but at $25 instead of $120+shipping, I'm not complaining at all.
I'll add this to the Parts Cross-ref as well.
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