Addendum - when hunting for part numbers, there are those which are not listed in the Parts Book for a particular model or series and only listed in the installation / user manuals for certain accessories. And as is the case with this, some of those manuals do not break them down into components. I found this part listed two places - there is an illustration/description of it in the accessory Owner's Manual for the 100219 "Custom Radio" kit for the Henry J. Part is shown and identified but no part number listed. The radio itself is listed in the 1947/48 KF Parts Books under "Accessories" and not broken down or illustrated. It is simply listed as part number 200001, radio. There is a part number listed for it in document "ER-5-230 Radio Service Data for 1947 Kaiser-Frazer Auto Radio" which was published by GE, the manufacturer of the units. It lists it as "RDB-012 BUTTON-Station selector button (Kaiser)." That makes sense because only the Kaiser would've used this since the '47/'48 Frazer actually had a push button as part of the dash motif. I remember my '48 Frazer had it, the center of the horizontal division sections pushed in and sprung back making it ready for factory radio installation if desired. The number RDB-012 is likely a GE part number as it is not the KF format. Pretty cool stuff.