My stock mirror was starting starting to fail, I saw this as a perfect opportunity to upgrade to a Homelink mirror.
Once removed it revealed the mount, Subaru has a bunch of different mounts, hopefully the 08 STI mirror I got fits.
Two mirrors side by side
Once I removed the adapter that the STI mirror came with, underneath was the same mount!
Bolted right up
Next was needing to replace the connector since they are different.
It's the plug with green, blue and black wires
New wire was $15 at the dealership (cheaper then people's custom made ones on ebay). Part number: H501SAG030
Plug it up and try it out
After that I had to set the zone to my location and force it into Config mode (press and hold the button for 9 seconds), then drive a car in a 3 circles.
For more instructions see: http://www.scoobymods.com/showpost.p...05&postcount=2