For drum-brake cars, were there 2 different hub sizes? 1 9/16 and 1 13/16 (1.6" and 1.8") ?
At some point in the past year I bought a couple of Dorman 13976 front-hub dust caps. I later discovered that they don't fit - they're too small.
At the time, the part was a Dorman 13967, but...