This has a short 1/4" D shaft, so any standard D shaft knob will fit it, as should any 1/4" hole knob. This is guaranteed to work great for you, though it may need some Deoxit. This is a pretty rare potentiometer and would be great on your guitar or amp. Please see my pictures for details.
US shipping and handling is $5, and international is $18, no matter what quantity you buy. All my small parts are set up for combined shipping, so just use the "add to cart" feature and then check out all at once, and it will combine shipping. If you have any questions, please ask.
I have more pots and other vintage electronics listed--feel free to take a look!