I got the following from member vwone (Dean). All I did was post it for him. Update 12 March 2008:
Thanks again to member
vwone (Dean) for providing emailing me the photos so this thread's photos could be restored!
Dean: "I had a couple of private messages asking how I made my backrest and I thought I would show how I did it. I got the idea from here but could only find one pic and no other details. So here is what I did.
1. You will need a 1/8"x1 1/2"x36" piece of steel from home depot. I think some of us has used aluminum.

2. You will need to hammer the steel into shape. It should look something like this.

3. Here is what the bottom of the pillion pad looks like.
4. Remove the four 10mm bolts.

5. Next, you need to make a bracket that will bolt the metal part of the backrest to the two bolts that bolt down the leather strap.
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6.Next bolt the bracket to the metal part of the backrest.

7. Bolt this assembly to the pillion seat.

8. It should look like this now.
9. Next, I removed the sissy bar pad from the sissy bar.
(Photo is still missing for this.) Don't need a picture though. Just unbolt it.

10. I then made a bracket to cover the back of the pad and bolt it to the metal part of the backrest.
11. Now bolt the pad to the bracket.

12. This is what it should look like now.

I built this in a couple of evenings and it was not hard. I didn't measure a thing, just eyeballed it and cut. I do have a small machine shop in my garage, but this could be done with a hacksaw and hand drill. It will just take longer. I also left out all of the details like what holes to drill or what taps I used, I assume you will build it differently. If it is needed I can add those details later. Have fun!"