replacing side mirror glass
As I recall the used replacement mirror had the female mount still attached to the mirror but once I observed how if fit, I was able to figure it out and remove the uneeded part. The "tricky" part is to evenly press the mirror glass onto the housing. They probably did this in seconds at the factory after doing a few dozen every day. Just go for it. The worse case is you have to buy another mirror but then you'll need to try it again. It's actually pretty strong glass.
The right side mirror does have more mounting tabs then the left. Adjust it to it's extreme to see if one of them is not engaged. I lived with a loose mirror for some time before snapping the loose end back in. The mirror has motorized screws that extend and retract.



