To set my sag correctly I had to cut 1 and 3/4 inch spacers from the PVC material provided with the progressive springs.I used 15w fork oil.I don't recommend Suzuki brand.It quickly goes from clear with a golden hue to that nasty crap that comes out when you first empty the forks.

Oh, my bad. Sorry for providing wrong info, I just remembered seeing that people on katriders weren't using spacers, so I assumed it was the same for the gs.