This product is either discontinued or we cannot get that from suppliers.
Poly Plantronics Spare Cs60 Headband 66735-01, Leatherette And Foam Ear Cushion, Black, Flexible and lightweight.
The Poly/Plantronics 66735-01 Uniband Headband with ear cushion is specifically designed for Plantronics CS60 , CS50, and CS55 headsets.