Good News! We finally got the grommets in also! The inside diameter of these grommets for these early Mustang knobs are, of course, larger to accomodate the larger knobs. These grommets were originally black, and the reproductions are, of course, black also.
Below is a picture of an original 64 1/2 Mustang Door Lock Knob and Grommet from a May 1964 production convertible.