My '55.1 had all beige knobs at one time, now I'm down to the wiper knob and brake release knob. Nobody makes the correct knobs as far as I know, so I now have black for throttle/choke/headlight knobs, as well as the cowl vent lever knob and the new 12v cigarette lighter. I briefly toyed with the idea of adapting radio knobs, since they're the only parts offered in the correct color, but that would be even more wrong than black. :mad:
BTW, the window crank handles were also that yellowish-beige; I only found one of those so the passenger side has an off-white Chev handle.