I think I'll just have to lay the original springs next to the new progressives and then measure and cut the spacers to suit.
I fitted my Progressive 440's yesterday and all I can say is WOW !! I live at the top of a hill and coming down are some real big dips that would have me out of the seat on the oem shocks.The difference in rebound now is amazing.Smooth as. Coming up the hill I cross over a spoon drain immediately followed by a transition from bricks to bitumen.This bump would have the back wheel bouncing off the deck (engine revs would rise so I knew this was happening)and me off the seat again if I was a bit enthusiastic on the throttle.Yesterday I deliberately gunned it over this bump and the bike rode over it perfectly.No more airbourne antics.Just need to fine tune the preload now.