I bought mine here:
Autodynamic.com
and the bases (bigger plastic triangle) were specific to my car and actually appear to fit the door pretty well. The smaller triangle is attached to the mirror and secures to the adapter base with 3 screws. They are much smaller and the stalk moves them away from the A pillar as Aerohead suggests. The VW mirrors fold so I came up with another solution. I'll try to post pictures tonight.