Thanks for the info.
. I bought progressive fork springs for my ZL 10 in 2013. $90 shipped. From what I was told by my parts dealer is that they was bought out then the Company went belly up.
When I installed mine my friend Ron A. told me not to use the two PVC pipes that came with the Progressive springs. Instead I used steel conduit pipe and he told me to made the two pipes a 1/2" longer than what Progressive recommened.