70 dart turn signal cam question, what the heck?

Here are the photos.
Photo 1.. the switch I removed from my 70 dart.
Photo 2 The NEW switch for a 70 dart. ( i ordered another thinking an error was made, they BOTH have the yellow cam)
Photo 3 The OEM cam laid over the NEW yellow cam.. the difference in the mouth opening is about 1/4" ( enough for the cancel tab to not catch)

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