Finally got to tearing into my column to replace the key-in buzzer switch I thought was bad. Turns out I didn't need to buy the switch after all. Originally the buzzer would sound even without a key in and door open. The broken lever must have jammed the switch permanently depressed. It eventually jarred itself out because I found it inside the collar.

Any recommendations on where to buy a 1970 E body ignition cylinder? I plan to swap out the tumbler pins too, so my original key will work. Thanks.