I got these LED signals from ebay:
http://www.ebay.com/itm/111112863790
The seller is from Taiwan
130$ a pair. Kinda expensive, but worth it.
These are only mirror signal assemblies.
You will have to take out the mirror glass, then take out the mirror cover to get to the signal housing.
The OEM signal has a socket meant for a connector, these LED signals don't have a socket, so it won't be compatible with the car's connector. All they have are wires that come out. You will have to find a way to tap into the car's connector's wires.
Took me 3 hours to install everything the first time.