Fred, the service manual calls for the bolts to be lock wired so yes, the requirement is standard for Packard at least for the '51-'54 model years. As for thickness, I'm not sure what they are new but over the years they most likely lose some thickness from compression.
Found this earlier post from HH about the washers and sleeves. You could actually substitute nylon washers in place of the original fiber or phenolic washers.
From HH:
McMaster-Carr
http://www.mcmaster.com/ has the washers Just search for phenolic washers. They also have a plastic sleeve material but not like the original. US Plastics carries that.
http://www.usplastic.com/catalog/item ... id=23765&clickid=redirect
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