Mother Clutcher aftermarket clutch made as an OE style Polaris primary (aka drive) clutch made specific for ALL 2015+ RZR 900 models including RZR 900-S, 900-4, and 900-Trail. This one has the EBS bearing (1 way bearing) in it LIKE CAME STOCK ON MOST 900 TRAIL MODELS. It came on some 2015-2021 RZR 900 ( FEW S models and most of the trial models. It can be used as a replacement on those, or to add additional engine braking between 0-5 mph on models that did not come with it. I also have the NON-EBS type that came stock on many 900-S models. This clutch also is tuned to get rid of the rough/ jerky take off problem original clutches had! Also stopped my 900 from making clicking/popping sounds on deceleration and coasting! This comes correct for ready to bolt on and ride with weights and spring already in it! WE have spent a good amount of time testing and revising these clutches before selling them to make sure they have smooth and responsive performance on RZR 900. FITMENT: FITS ALL PACKAGES OF 2015+ RZR 900 (including RZR 900 S, 900-4 and 900 Trail). Manufacturer Part Number: 1323181, 1323283 , 1323308