I think they are 9.5nm spring, everyone sells 10nm and up, no one has the 9.0 as far as I know.
there is a kit that changes the spring location from the bottom of the fork to top so the replacement can be made easy.but what I have found out is that the valves need to be replaced too.
https://parkitt-performance-motorcy...howa-bff-fork-upgrade-kit?variant=19137869574
one way I am using it for now is to take most of the rebound out so the reaction will be faster which makes the bumpy roads better.