I bought a set of sockets, the ratchet and two extensions back in 1970. It is the ratchet on the left. The chrome is worn off completely where it has been set down on concrete a few 10s of thousands of times. And yes, I still have the 10mm socket for that set!
The ratchet on the right is a new one I had to buy to do the pulley seal fix for my 85 911.
Golly I hated to have to buy new tools. I bought it from Home Depot as they sell individual sockets and ratchets. It fit right on the nut and made quick work of it.
The thickness from the back of the ratchet to the top of the socket was the issue.
It was needed to get a socket and ratchet on this nut.
The new ratchet does have more teeth and a smoother feel.