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Hi Gruff,
The seat can be found on this following website... looks like it comes in black... the black part number being 90-949015
http://g-t.co.jp/parts/P_428.php
The shop I bought it from is here in australia (
www.deusexmachina.com.au ) but they don't have an online store. plus they are way more expensive anyway....
You will need a japanese friend to navigate/order it for you... I could get one for you here in OZ and post it to you... think I paid around AU$350... certainly not cheap!!! but I love it, and don't regret it. I wanted a very slim seat that would still comfortably carry 2. and its been great.
Best bet would be to find someone who speaks the language and order is direct from japan... its only US$140 then.
Fitting wise... i just bent the 2 front pegs on the new seat, and they slipped straight into the mounting holes on my 81 special. if your xs has the hinged seat you will need to find another way.
I still haven't done anything about screwing the back down, it comes with mounting screws, but the SR must be different... on the XS the screw holes line up with the top of the shock mounts, and I don't want to drill through that section of the frame! I was going to make an adapter... when I get around to it.
But it fits the frame rails perfectly, and the back of the seat sits just inside the loop on the back of the frame. I ground off all the mounting tabs and supports for the original seat, just for looks.
If you want more pics let me know.
Jambob