What did the blade come off of? Kubota front blades mount to a quick hitch in the front and I would imagine there is a standard size for the quick hitches... If the blade comes with the whole quick hitch system I think the real question is " Does the hitch fit your machine"
You'll need the model number of the hitch... If it doesn't come with the hitch that is an additional cost to be considered and they are not inexpensive.
Good luck,
Chris