I spotted them. Almost identical.
here is the link......the codes are K21-6M and K21-BLK-L and black cap without line K21-BLK
https://www.tme.eu/gr/en/katalog/knobs-for-shaft-potentiometers_100026/?art=K21-6M&page=6
I have already received them and they look like this in my 1997 growler 4...