I assume you have to measure the pot shaft too. Thanks for the tips. I'll try the knobs but maybe I will just change the pots too.The pots are split shaft push on knobs, any push on knob you find will work.
Important to note the pots are cheap and fragile, so be gentle when putting the knobs back on: don’t push too hard or the pot may come apart.
Look on Amazon lots to choose from.