PTO adapter, accepts 1-1/8" X 6 spline male shaft and adapts it to a 1-3/8" X 6 spline shaft. The adapter measures 1-7/8" in length. Allows using standard 1-3/8" X 6 spline PTO shafts on older 1-1/8" X 6 Spline gearboxes. 1-1/8" X 6 Spline female 1-3/8" X 6 Spline Male 1-7/8" long We sell many replacement parts for the most manufacturers rotary cutters. If you don't see the parts you need listed please contact us we would love to earn your business. We are listing new items frequently so please check our store often. Part Numbers: 11972 We stock a wide variety of replacement parts for Agricultural Equipment please contact us if you have any questions or if you would like more information.