As Mal mentioned, the parts lists usually have the screw sizes and quantity needed to attach an item listed further down in the group categories. In many cases where it is not obvious as to what is needed, the part number for the fastener can be found and then looked up in the utility section where more details, and in many cases illustrations of the actual piece are shown. Utility items were fairly standard throughout the years so a later parts manual may show an earlier screw if it isn't listed in the years manual. If that still doesn't work then the expert knowledge available here will soon have an answer.
I don't know of any complete charts that give a direct correlation between metric and US sizes either but if you do a google search for
metric to imperial screw interchange, there are several individual charts of varying categories that show in the first few listings which do show some common features--hole sizes, etc. Here is an example
http://freespace.virgin.net/matt.waite/resource/handy/screwsize.htm If you don't have a good US hardware source available in the UK, some companies do offer complete fastener kits for various other cars (no Packards as far as I know) with common sizes. Unfortunately, Packard might use the same screw thread and length somewhere but a different head. As O_D mentions, many head styles are now obsolete. If you just want a source of modern quality grade US screws to have on hand without buying in bulk quantities, that might be an option. Here is one such company
http://www.amkproducts.com/default.htm I would avoid buying any of the common screw kits available in many stores because of the unknown grade.
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