The "washers" for tail light bezel screws came up, these can work as a replacement, though you can buy #8 counter sunk washers that are close.
The package calls these ferrule washers, but I think they're really "Cup Washers" or "Neck Washers". Difference is, these are #10, the original screws are #8. No sign of a #8 replacement "cup-washer".
The length is a bit too long. I mostly ruined the first with my vise, that doesn't work, but luckily the package has five pieces
So the last four were slipped onto a nail to hold it in place without ruining them, with just enough play so the washer spins freely between the vice & nail head of the nail for an easy cut with a Dremel. I cut more than I needed, Curtb1971 provided the exact measurements previous page. Can sand/polish the top rim using the nail if need be.