I have an auto-dimming mirror and would like to mount it in my 04 WRX.

The problem is, Subaru uses what is called a camlock mount on their mirrors:
http://web.triton.net/p/prim/stuff/mountcamlock.mht

The mirror I would like to mount has the wedge mount:
http://web.triton.net/p/prim/stuff/mountwedge.mht

How do I make get this mirror to mount in my vehicle using the existing mount? Any idea if there are differences in the mirrors beyond the mount?

Thanks.