Originally these knobs were an unusual light translucent color (wish I knew what to call the '62 color) See pic. with white '61 knob on left and opaque '62 heater button on right to show color difference. Always worth a good scrubbing with a toothbrush and comet before painting/replacement. You may be surprised. Have also had good luck using 2000 grit wet sand paper and a plastic specific polish on the broad flat surfaces of the shifter, heater, and radio buttons. Useable on the other knobs but much more labor intensive with all the peaks and valleys the knobs have. Have some extra '62 knobs if not restorable. PM me for specific needs if interested.
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