Roland VP9000 Controller KNob replacement

Hi,

I am trying to source replacement potentiometers for the Pitch, Time and Formant knobs on the VP9000. Mine are being jumpy when they are rotated. I know they were originally Panasonic EVU-JEGFK3B14, with a Roland Part number of 01893801. Roland calls them VR601, VR602, and VR603 on the volume board assembly. I am not looking for the originals (but i would take them) i am looking for a modern part that will fit. They are center detented.

Thank you!