Mirror does not come with glue on windshield mount
See:
477.845.043 Windshield Mount
MA2 Mirror Adhesive
Fits:
911 78-89
C2/4 89-94
993 94-98
924 76-82
924S 86-88
944 83-91
968 92-95
928 78-95
Reference/Interchange Numbers:
477857511A01C/477.857.511.A.01C