since these caps are standardized many caps from old amps, receiver, tapedecks whatever will fit.
I didn't like the original so I use a bigger knob (more like the one from the s1000). Found it on a broken tuner/amp that was sitting in my cellar and waited for this moment to give awy this spare part



There are two different types of shafts (well there are more but two are the most common)
you neet a knob for this type

and NOT this type

So go around in your house (or your peeps house or wherever) and if you find a knob you like, grab it and look if it uses the same shaft. If so......take it

peace