Please be more specific what you are trying to match up. If you've got a difference in spline configurations or need more length you can probably find an adapter at Tractor Supply or somewhere online. Shouldn't be a problem although you may need some measurements and /or perhaps a couple photos.
If however you have one of the Kubotas that PTO runs "backwards" and you pump has to rotate "normally", then you need an adapter that changes the direction of rotation of your machine PTO shaft. In this case try salvage yards and just keep looking. For new, track down Boston Gear Corp--they used to produce an attachment that looked like a figure-8 with a female opening that slid over your PTO and immediately adjacent a male spline your pump would fit to. These were originally intended to run standard bushhogs and tillers with machines having backwards PTOs.
Please post back how you resolve the problem so we may all learn.
