[Grumpy old man]

use Au-Ve-Co part # 16015 Pic 2

https://www.clipsandfasteners.com/se...show=45&page=1

These are # 10 flush type washers and they are just a hair to small to fit over the 1/4 x 20 chrome oval head screws Pic 3

Easy remedy is to use a punch and just barely enlarge the hole to fit the 1/4 x20 screw and still sit flush with the head of the screw , Pic 4

Take a scrap piece of wood and using the punch -Punch a hole in it , this supports the washer and keeps them from splitting Pic 5

Other than these old trucks I don't know of any other vehicle that uses a 1/4 x 20 flush type washer on the interior .