Replacement focusing rubber ring for Zeiss Planar 50 f1.4

For this vintage Contax mount lens I am looking for a replacement rubber ring for focusing with a diameter of about 60 mm. I can't find any specifically for this lens, but all I can find, which is offered for other lenses, sellers do not specifically indicate the diameter of the rubber rings. Does anyone know of some specific contemporary lenses that have rubber parts with this diameter that I could buy?
Or some other source for a replacement ring for this lens?

The modern Rollei lenses had a rubber ring. The vintage ones had metal. Maybe you could find an inexpensive "Singapore" planar and take the rubber ring from it.