@Crunch
There are enough Tumblers in the Set to even rebuild the Dorman 3x with new Tumblers if needed.
Mine works flawless like it is a new cars feeling. Nice.
I doubt your issue is the Lock assy more than likely it's the switch that attaches to the lock.
There is a pin at the end of the lock cylinder that is pushed in with the key, that makes the chime.
Check your old electric switch for it. Small pin right in the middle of the turning unit.