The 72H3A Touch-Tone dial is often found on WE 2500 DMG, 2554 BMPG, and others manufactured or remanufactured starting in 1983. The connections are slightly different from those of the 35-type dials. When replacing a 35-type dial, if there is a polarity guard in the telephone set, it should be removed. The 72-type dial has a built-in polarity guard.
See attached table from TCI Library.
"D" is the screw terminal on the back of the dial.