Replacement diaphragm for the pump on the Weber IBR series carburetors.
Please note that this diaphragm is the "floppy" version as shown in the picture.
The solid cam is 5.25 mm tall, measured from the face of the disc.
The diameter of that disc is 22 mm.
Please compare this diaphragm visually and carefully with your old diaphragm as over the course of the years, various different versions were used which are not necessarily interchangeable.
Weber Part Number: 47407.045