Looky here, after all this malarkey of dampers, YSS and binsSoggz you need a K1100rs! Check your spring rateEbay BMW K1100RS YSS DamperLooks like the right size box
Stock OEM Damper lengthK75, K100 (monolever)- 360mmK100 4V, K1100- 390mm
Measured center hole to center holeThose are general valuesYour damper length is your preference