The tour pak came from Scootworks: http://www.scootworks.com/shop.cgi/page=partskawtrunk.htm/SID=PUT_SID_HERE
I went all-out and got their SuperTrunk III, studded back rest and luggage rack. The backrest is manufactured by Mustang Seats. It appears to be made for Harleys, since the mounting instructions referred to mounting it on Harley tour paks. It might bolt right up to yours. (I had to drill my own holes.) Seems to be very good quality. My wife is much more comfortable, now.
The speakers are from Hogtunes: http://www.hogtunes.com/
Since I got the Eclipse 4000 with the Hoppe fairing, all I needed was the speakers and a wiring harness. Didn't need the additional amplifier. I did have to re-wire the fairing speakers, but that was pretty simple. I forget the fella's name at Hogtunes, but he's a super guy. Talked me through the re-wiring. (Hogtunes is in Barrie, Ontario. Who'd have thought?
My saddlebags are the Yamaha Road* hard bags. I bought them from a dealer selling them on e-bay. A bit cheaper than buying from the local Yamaha dealer, but still pretty pricey. I got the Yamaha saddlebag liners, too, from them.
Let me know if you have any other questions.