I had earlier asked if anyone had ever cut down an OEM seat off an I/S, planning to use only the rear portion as a separate piece. Here's what I've done thus far, it's still a project in progress but seems to be going in the right direction. The front seat is an Ultimate King so I could have taken an easier approach by simply buying the separate rear for over $200 and having it covered to match....but I'm cheap!

Here's how the seat started out.

I initially cut along that rearward line of stitching just to separate the two sections. Here's the seat once the back portion was amputated.

This is where I am at the moment following cutting/trimming to get it to sit down on the fender and fit in behind the front seat. There is still more trimming to do, during the process I only cut a minimal amount each time to prevent removing too much. I also had to trim the opening on the fender at the back where the front seat came in contact with it. Quite a white dust storm created using my air driven die grinder/cutting wheel. You can see where the rubber trim is pulled away, I had to remove close to an inch for the front to go back far enough to latch. Notice how the unfinished back piece nicely fills in the area surrounding that section of the body.

Here's the OEM pillion taken off the Tourer. I wanted to see if it would fit before I started cutting up the one piece seat. As you can see...it doesn't, plus it leaves a large open area surrounding the pillion.

Once the back section is trimmed so it looks even on both sides, I will fabricate a plate to mount under the front so it can be bolted down in the same manner as the OEM pillion. I haven't decided if I'll fiberglass it in place or use rivets. At the back, there's a rather large open area under the backrest. Once done, I'll most likely cover it with a single piece of leather, not a high priority at the moment.