These driveshafts are tough! 5/8" shaft Direct replacement of  your stock Cub Cadet shaft or get a longer shaft for custom applications. Fiber shaft hole spacing is the same as the stock Cub Cadet driveshaft and the length is the same as stock, be used with a stock coupler unless you buy our 3" coupler, then we shorten the shaft. Metallic shaft has a wider pressure plate spacing to allow for the stronger metallic clutch disc. Coupler denotes a pre-shortened shaft to be used with our 3" coupler.  The 3" coupler is not included with any of the driveshaft. Coupler must be ordered separately part # 51140.   These driveshaft will work in your puller or Cub Cadet Mower.