I believe Targa makes an aftermarket seat cowl. They do a good job of color-matching their stuff, judging from the rear wheel spoiler I got from them.
Source:
http://www.targa-acc.com/
You can also get the Kawasaki part (53065-1053-B5) for the ZX9R. I don't know if the seams will line up perfectly, but I know it will fit, because I've swapped passenger seats with my '02 ZX9R and my wife's '02 ZX6R and they fit perfectly.
Good luck and let us know how she goes.
-CCinC