Looking for Stromberg-Carlson knob

[radio63]

I'm looking for a knob for a Stromberg-Carlson radio. This knob was used on a number of models but the particular set I have is a model 228-H. It's a dome shaped knob with four grooves cut into the sides. Back diameter is 1 1/16" and it is about 7/8" tall at the high point. If anyone has a spare they would sell, I would like to purchase one. I really need one that has three colored dots on the side for the band indicator, but an unmarked one would be fine as well. Also any leads or help would be equally appreciated. Thank you.

Gilbert