10″ rear brake shoes- circle vs rectangle hole for parking brake

Hi all- while attempting to do a major detailing of my 10x2.5 rear brakes, I ran into a problem where I received shoes with a rectangular cutout when their catalog shows a circular hole for the parking brake lever. In researching, I'm finding both versions show up for e-bodies and the application apps for the vendors don't distinguish anything different by year. It's clear they aren't interchangeable. Is this a year to year difference that the vendors don't account for? My favorite...

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Author: benguin