You need to be more specific about your heater. Heaters were an option and there were dozens of aftermarket ones used.

I doubt if anyone is reproducing knobs for a specific heater. You'll probably have to find some aftermarket knobs that will work.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.