Ping does not use the Collared ferrules with their irons. You could use a .355" ferrule such as the 66TI, 67TI, 75TI or 76PI. Most of the time with .355" taper tip shafts I will use .370" ferrules and they work just fine. A .355" taper tip shaft will have tapered out to approximately .370" where the shaft exits the top of the hosel and the .370" ferrule will fit fine. The 74PI looks similar to the size that Ping installs from the factory.
Date published: 2014-12-08