If you just look the surface area they arent. You just need to put the clubhead first on mirrors place where you will get the place for mirror glas. After that rotate clubhead 180 degrees and make the clubhead little big bigger and make the face area round with wire mesh. Few other mirror aerodynamis changes like the side which is facing cars A-pillar needs to be modified.
I think I took the surface area from this model:
Google Images
After few tweaks it started to look pretty similar than this MK5 golf mirror:
Google Images