Just did mine today. Same. I was just yanking on it assuming I was fighting the two sided tape. Crack a lack, the thing finally came off with a bang, lol. Two brackets snapped off clean and could be epoxied back on if I ever want to use the stock piece again.
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Might get to the mirrors on Wednesday. Snaggy, your reference material is set to private, can’t see the install info. I’m sure I can find F150 mirror cap replacement on YouTube though. These really look great on Avalanche Gray just like I thought they would.