The old one was the STA (end)pin rest, but is no longer available. I got one about 30 years ago, but over time the rubber got hard and the disk slipped. That old version worked for up to 12mm endpin diameter.
There is a new one on the market (also for cello) for endpins of max. 10mm diameter. Cannot remember the manufacturers name but they should still be available.
I'm more happy with the Wolf Super-Endpin (rubber ball with a socket). That works better than the disk, but since the rubber is soft, the ball easily gets a hole at the bottom over time.
Since the rubber balls are not available alone, you need to buy a complete assembly when the ball is damaged. I prefer a normal rubber stop for transport now (or an already damaged ball) and the next Wolf ball only gets mounted when I arrive at the destination.