1969 Dodge Dart Ignition Assembly

Look like you got the wrong switch.

Here is what a 1969 Dodge Dart switch looks like on e-bay. The same as your switch on the right.

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The ignition switch on the right is incorrect for a '69. It's diameter is too small for the dash opening hole. '69 uses a one year only big diameter switch (the one on the left) and respective lock cylinder and bezel. Most models also use a plastic trim surround too. That part isn't necessary to mount the switch however.