Up for sale here is this Pioneer SX-580 plastic tuning wheel with the complete dial string and the tuning needle. This is guaranteed to work for you. It may work on other Pioneer receivers and possibly on other receiver brands as well. Please see my pictures for details.
US shipping and handling is $4, and international is $14. I accept Paypal. If you have any questions, please ask.
I have a number of other Pioneer SX-580 parts and other vintage electronics listed--feel free to take a look!