All 2016 - 2021 Honda Civic trims that do NOT have Auto Dimming Rearview Mirror Housings. Confirm your rear mirror is Donnelly 045617. You can check that information on the back of the rear mirror.
The SUMA Performance Rearview Mirror is a quick and easy modification to double your visibility, and eliminate glare entirely. Simply remove the adhesive on the back, line it up, and set it firmly on your existing factory rearview mirror - you do not need to remove the OEM mirror, this sits on top and covers it entirely.