Progressively wound fork springs can be had from:
http://www.davequinnmotorcycles.com/...webc/home.html
I've just received a set along with the rear shock for my bird. They come highly recommended and I can't wait to get them installed. I didn't want to refresh one end without the other so I got both for $501 - $375 for the shock and $126 for the front springs.
BTW, Dave Quinn is in Ct - maybe you'll save on shipping. Good luck!