This listing is for a replacement button cap for Roland 501 power switch / Roland CR 5000 / 8000 drum machine.
This is not an original Roland part but a brand new replacement part.
It is a bit deeper than the original white button cap so it’s not perfect but fits just fine (see photo).
The listing does not include the actual power switch but only the plastic cap.
It will also fit the Chorus/Echo/S on S caps on the 501.
I believe that there's other Roland gear that uses a similar size cap. Please research before purchasing.
Shipping costs for each additional cap will be $0.35.