superglue wont work if you want it to last and any other adhesives or glues require a long time to dry and a rear view mirror is very awkward to hold in position till glue sets..If you get a good quality contact adhesive that will work best..
Selleys Kwik Grip Advanced - Contact Adhesive | Selleys Australia
something similar to this will work well...
otherwise its a new windscreen so i would be trying this ...make sure you clean both surfaces and scuff them so the glue bonds to the surface..
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