This clutch was a direct fit on the 2011 Polaris RZR 800. The original OEM clutch had worn grooves, resulting in unpredictable and jerky power being delivered to the secondary. After installation, and observing the belt position on the clutch bearing, one of the OEM secondary hub spacers needed to be removed to properly align the belt centered in the new clutch. The power transfer from the new clutch to the secondary was noticeably more smooth. Will update this review after having operated this clutch for much of the spring, summer, and fall of 2023.