The stud at the tail of the front parking light body on the 56th Series Senior cars utilizes a cup washer, P/N 387940 (Gr. 4.1400). That's the only one I've removed and inspected from any of my '56s.
Turns out that same P/N is also used for fender-mounted compensator solenoids (Gr. 4.2265) and a couple of body moldings.
However, a different cup washer, P/N 183962, is specified for the fender-mounted pushbutton shift and automatic park relays (Gr. 3.31446 and 3.31442, respectively) and firewall-mounted A/C relay (29.620) power window relay and breaker, power seat relay and breaker, as well as a couple of other moldings in the Body sections.
These applications appear don't appear to be highly specific to the diameter of the screw or stud Most are for #10 or #12, but I did find P/N 183962 listed for a #8 screw for a front seat side shield moulding (5682-87 models). I'm sussing then that the difference has more to do with outside diamter and or overall height.
In a pinch, I figured that I could find a cup-style core plug (for engine blocks) and drill a centered hole.
Meanwhile, here's a boatload of cup washers to choose from:
http://www.hkmetalcraft.com/Products/Catalog/Washers/CupWashers0000-3000to4701-5800CP.shtml ...but not sure f that the style/sahpe you;re looking for. The one for the parking lamp, IIRC, has a rounded top.
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