Pday--
I just did the exact same thing this weekend (sissy bar, backrest, luggage rack), and I used the Yamaha products. GREAT quality, and eBay is the only way to go as far as price.
A word to the wise, though (from the post-installation NOW wise - LOL). If you use the Yamaha products, do yourself a favor and don't follow the instructions...exactly. The instructions say to mount the sidearms and THEN bolt on the sissy bar. Well, I had the backrest support sidearms & the saddlebag supports all mounted and was ready to put the bar on, and then realized it was going to take a lot of turning in tiny little increments with an open-end wrench to get the four short bolts on that mount the sissy bar to the sidearms. When the sidearms are mounted first, there's like an inch of clearance between the supports and the rear fender to try and get your fingers in there and start the thread of the four bolts. Well, I don't have small hands, and I knew in advance it was gonna be a knucklebusting, frustrating task. So, I took everything off again and assembled the backrest bar and sidearms BEFORE putting it on the fender.
Once you do this, it'll be a tight fit getting the whole unit to slide over the fender and line the sidearm bolt holes up with the holes in the fender. It's a trememndous opportunity to scratch your fender paint

, SO...glue the felt washers (if you choose to use them) onto the inside of the sidearm spacers (where the bolts pass through) before you slide the sissy bar assembly into place. This will protect your fender. If you go with no washers, get a couple sheets of thin plastic (8.5 x 11 sheet protectors would work well) and use those between the sidearms and the fender as you slide everything into place. Once the holes are lined up, you can yank the sheet protectors out and you're good to go.
It'll save you a lot of frustrating wrenching in the end...hope that helps!
RK