- Antenna adapter - Metra 40-VW53
-Wiring Harness - Metra 70-1784
-Sirius Tuner, The Tuner is not actually built into the radio and you need a seperate eclipse product. Eclipse Sirius Tuner
-Steering Wheel Controls - Definitely use the Connects2 products, My experience with the PAC products has been shoddy at best. According to Connects2 You need the CTSAD002 - which is the 07-08 Style. I am not sure about connecting that to the eclipse radio though.
I have no experience in using the factory antenna, It should just a standard NMEA antenna, You may try searching for the pin-out (i tried but could not find anything). I recommend using the eclipse antenna. You may be able to Open up the stock sharkfin and put the eclipse antenna in there.