Dean Dinnetz ( a member here) sells R6 units with the required adjustments.
The other option would be the BMW S1000r shock circa 2012. When
I bought mine they were mainly being taken off the bmws and didn’t have much other use. I paid $45 and had a 700 lb spring I added to it for two up. Now they are used by a couple different bikes as upgrades, so more expensive and harder to find on the bay now. I also have a Penske and the BMW shock is not too far off. I hear great things about the R6 shocks as well. PM Dean and see if he has any left.
The other option would be the BMW S1000r shock circa 2012. When
I bought mine they were mainly being taken off the bmws and didn’t have much other use. I paid $45 and had a 700 lb spring I added to it for two up. Now they are used by a couple different bikes as upgrades, so more expensive and harder to find on the bay now. I also have a Penske and the BMW shock is not too far off. I hear great things about the R6 shocks as well. PM Dean and see if he has any left.