I tried a bit on eBay to see if I could find them again since that is where I originally got them. Shipped out of the UK of all places. Can't seem to find them anymore on eBay. But... there is a link on AliExpress. ptbo micra got his there; maybe he can verify if these are the exact ones he bought.
You would be looking for something like "HVAC Knobs" or such.