I bought a used 2008 Mazda 5 ES (that's kind of a GT minus leather here in Puerto Rico) recently and one of the things I missed from my previous car was the Homelink transmitter. I visited a local dealer and checked the web in order to find a suitable alternative and found the OEM Homelink rearview mirrors but the price always exceeded $250 plus shipping and taxes, kind of pricey in my opinion since I didn't need a compass and didnt think the auto-dimming feature works as well as flipping the little tab behind the mirror. Then I found various forums and saw that a lot of people were installing used homelink transmitters bought via Ebay and that the installation was very simple and straightforward, just connecting the positive and the ground cable to a 12v source, usually the overhead light assembly. I then bought the used transmitter for $30.00 (I bought the more expensive one with rolling codes) and decided to try. And... Voila' in less than 30 minutes I had a homelink transmitter in my car. No more fumbling with remote controls inside the car.
I don't have pic's of the installation process but I'm including 2 to show you how it looks. Imo it looks great, doesn't look out of place and it's much cheaper and easier to install than the rearview mirror. The only thing I was a little affraid of was the small cut I had to do in the headliner but thanks god, I didn't ruined anything.
This is the link I used as reference for my installation. It has pics of the installation process:
http://www.newscionxb.com/135-do-you...-homelink.html