I'm sure your Kubota dealer has one, and you should find it competetively priced. Then, either cut the original mounting ears off your bucket and weld on a skidsteer plate..... or buy a new bucket to fit the skidsteer coupler.
JD 4520, Toolcat 5610, Bobcat S300, Case-IH 125 Pro, Case-IH 245, IH 1086, IH 806
I bought one of these for a Kubota CUT I used to have. Hitches Kasco Manufacturing Co., Inc.
They make both the tractor and bucket adapters. Otherwise just buy the tractor skid steer attachment. Then cut off the bucket mount and weld on skid steer plate.