The Ford Barn - Parts for 1939 Ford / Mercury Radio

Working on a radio for a 1939 Ford / Mercury. The dials that are in the radio head appear to not be available. My tuning dial is good, but the dial on the right side is toast. Now it appears that in 1940 a similar setup was used by both Philco and Zenith. The script type used both years appear to also be the same. But no, the parts do not interchange! However, does anyone have the specs on the parts that are available? Diameter, width? Looking at them, if they are the same diameter they may possibly be modified to fit the 39 radio. Does anyone also know who is reproducing these parts? I know Radio Daze does some automotive parts, but no advertising for this unit. Is this another one of those Dennis Carpenter deals (which I hope not). Once I have all of the data, and if no one else has made this work I will share my findings.