That should "slide" and snap back into place if the top bracket with the 2 screws is undamaged....
Otherwise, you may need to find that part - if the side tabs won't hold the mirror assembly anymore...
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99LSGUY,
Thanks for your tip, after taking a better look in a more relaxed mood I figured it out.
“Slide and catch at one end and push in to catch the other end”
I did not reattach it yet because I will try to get a new metal and plastic brackets, the plastic bracket was bent a little and I am the type of person that will sell the car if I had a vibrating mirror.
“Picture attached"
Thanks Again