Kevin
I asume, that when you say, GTA, that means ‘Greater Toronto Area”. Also are these pictures of your Radio. If so Dan is correct it looks like you already have the Knobs. And what do you mean by “The knobs came off “Did you lose them”? And what do you mean by ‘Missing parts for the Knobs’? Having those answers, may enable us to help you.
And if I am correct, and you are in Toronto, there will be a Vintage Radio Swap Meet in Guelph, ON on June 11, 2022, at the Hammond Manufacturig Plant, on Speedvale Avenue, on their East Parking Lot. Usually at these Swap Meets there are vendors there who are selling lots of Radio Knobs, as well other Radio related items. This does not mean that they will have what you are looking for, but it is worth a try. And Guelph is not that far from Toronto.
Ralph