And the funny part is the washer is shown in the 1955.2-1960 GMC Master Parts Book drawing, but has no reference number. (See ^ on page below.) It isn't shown at all in the 1939-53 GMC Master Parts Book.
It’s in group 8.0955 (A) 105451. Check out that group in your 1939-53 GMC Master Parts Book. My 1939-1954 book shows “SEE 20.0340” which is a Fuse.
