Where can I buy knob caps of this style? (See picture)

I would like to buy black rubberized knob caps as featured on the Access Virus A, Future Retro XS and many Mutable DIY builds. They look like this:

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Where can I buy this kind of knobs? I searched online to no avail. I have an anushri that was not built by me and I would like to switch the knob caps to this style as they are more comfortable and good looking than other plastic ones.

Mouser 450-BA761 or Farnell 1441142

Thank you!

Try this link : RUBBERIZED POINTER KNOB FOR 6MM KNURLED SHAFT | All Electronics Corp.