There are places in the Southwest that specialize in old stove restoration.  One went by the name Old Road Home or something similar. I think that if you did a Google search for old stove parts or old stove restoration, you could find links to some places. There used to be a lot of stove restorers in California, but I don't remember any names.  Maybe others here will be able to offer more help.

Magic Chef pioneered the oven regulator for temperature control on gas ranges. They called it the Big Red Wheel and it was on the side of the range. There was a knob on the front just like the burner knobs for turning on the gas supply to the oven, but you set the temperature on the wheel. Friends had one decades ago and it was old then. For decades since then Magic Chef's oven knobs were red to varying degrees; some solid red like yours and some with red wings that you gripped for turning at the top of the knob.