I'm not sure who this will be helpful to given that this drier is absolutely ancient, but a repairman I had fix an unrelated issue with the drier quoted us 50$ for a replacement for what amounts to about 10 cents worth of plastic so I made one myself.
Matches the original knobs fairly closely, fit is snug enough to not come off accidentally, but can be easily removed if desired.
Fits Kenmore Drier Model 970-78712-10
The author marked this model as their own original creation.