I just picked up a TourPak on ebay for $650 off an 05 Ultra Classic. It was delivered today and I'm hoping to get it painted next week. Why do you have to remove the fairing? Is the light/speaker harness not already installed behind the left rear side cover?
No, it is not, except for the Ultra Model (that comes with it already).
You have the speakers already so you will need the Rear Speaker Harness (77157-06). This is not a "Kit". It is a Harley Part. I found one on ebay for $15.00.
If you just want to add just the rear speakers, you can just look at the wiring diagram and use the wires from the Speaker Harness into the plug on the back of the radio and not use the switches. You will still need the download from Harley to activate the Fader Control. It should be at No Cost because Harley does not charge the dealer for it.
If you want to just have a Plug-N-Play set up, you will need to purchase the Non-Ultra Harness (70169-06). You need this no mater how you go with the Tour Pak. (Except as stated before)
If you intend to Permanently mount the Tour Pak to your bike, use the Boom Music and intercom Kit-Tour Pak Models (76440-06) and Communications Switch Kit (77173-08).
If you want to have the detachable Tour Pak you need the Boom Music and intercom Kit (77108-09A). This will give you the ability to use the Intercom, with or without the Tour Pak.
No mater how you go, you will need to decide what or how you will mount the antenna. You can just use the Antenna Relocation Kit (76561-09). or as I did, mount it inside the Fairing. This makes one (or two with a CB) less wire to worry about when you remove the Tour Pak.
No matter how you go, good luck and have fun.