IStop by any windshield repair shop - I would leave the stock puck and add another one higher. Removing can be done but I wouldn’t take the chance of breaking the windsheild. New mirror will block the view of the old mount.

I ended up JB Welding a standard puck on top of the Isuzu puck as I was impatient and wanted to install my new mirror 5 yrs ago that had map lights, temp and compass.