One suggested source to try:

https://www.ebay.com/usr/packsea?_trksid=p4429486.m3561.l2559

Walk thru an amazing automotive parts store / warehouse closed for 23 years.

https://www.youtube.com/watch?v=9CiHOh36tAY

Some of the 30-32 OEM Std 8 covers Ive seen don't have this cork insert.

https://www.ebay.com/itm/153472733007

Could this have been an aftermarket item?

I'd agree it was for noise reduction.

Some modern diesels use foam inserts to deaden noise.

https://www.cumminsforum.com/threads/tappet-covers-engine-noise.573103/

Some additional service instructions for King Seeley gauges.

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You'll notice this isn't specifically for the 9th series eights, but I've used it as a general guide.

Marty,
Here's some detailed info on how to adjust the steering box. Drag links should also be checked to make sure the slotted plugs are screwed in enough so the springs are compressed enough to prevent excessive play. I've used GL-4/5/6 85-140W with no problems. With proper adjustment on good gears I have about 1/2 to 5/8" play at the outer edge of the steering wheel.
Dave

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9th 10th 11th Series Packard Steering Gear Adjustment Process.pdf Size: 259.42 KB; Hits: 35

All - 2023 update
The acetylene tetra bromide sample I dyed with Sudan #2 dye lasted for about 2 years before finally turning a light amber.

I've been researching other heavy liquids (the density has to be around 2.85 to 2.96 g/ml) for the gauge to read accurately.

So far I haven't run across one that is the right density and as stable as the original fluid used. The attached .pdf lists some of the fluids I've looked at.

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It's been a while since I removed the cover, but I think the threaded holes for the steel cover studs go thru the pan casting. Some sealer on the stud threads would help take care of a small leak coming thru the threads.

Also, with the oil drained, a nickle plated NeFeB magnet placed in the pan plug does a good job of collecting fine magnetic particles. I found a size that fits right into the existing plug. Did the same for the transmission and differential plugs. Works great.

Packard Pedal Car, nice details.

https://bertoiaauctions.hibid.com/lot/16296636/gendron-packard-pedal-car?q=Pedal%20cars&apage=2

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  Packard Pedal Car.jpg (61.28 KB)