According to the parts books, that washer should be 17/32" ID, 1 5/8" OD, and 5/16" thick. Original GM part number 591472. Don't know what makes it special, besides the extra thickness.
Curt ---- 1953 Chevy 6400, 1957 Chevy 2dr Sedan --"Mediocrity is easy, the good things take time"
