Gas-charged with fade-free damping and consistent operation Automatic, six-stage damping adjusts to a variety of conditions Special cams allow easy preload adjustment Springs sold separately; available in a variety of rates; part #s DS-222014-16 and DS-310030-32 are recommended All shocks are measured center-of-eyelet to center-of-eyelet. Before purchasing or attempting to install shocks that are different than the OEM length, confirm that your wheel travel can be altered without causing clearance issues such as, swingarm/axle to exhaust contact as well as chain/belt guard or tire contact.. 11.5"SHK 1200 SRS H-D BLK