You can obtain the Progressive Springs part # from here:
http://216.185.131.5/street/suspension/psforksprings.htmlI replaced both fork seals and springs last year. Replacing the seals
will require a special tool to undo the nut at the bottom of the
fork so you can get to the the old seals to remove them.
The spring replacement is straight forward. However you will
require spacers at the top of the forks 1.5 inches. They
are mentioned in the instructions.
I ended up using a nut and bolt combo that I procured from Home Depot.
Cliff
XJ650RJ