I have the watsons instruction but unfortunately don't have a scanner at the moment (plus the pages are A3 size) - being in Australia doesn't help much either (can't exactly zip around to have a look!).
Here is a link detailing some of my installation (I used the full kit though rather than retro fitting)...
http://www.manxgallery.org/gallery/album228
If you are really stuck I guess I could take a pic of the insutructions with the digital camera then email them to you? Let me know.
Cheers
Alan
