Go to the Kubota web site and click on Prior Products under tractors, then look up your model tractor. When you find it, there will be a tab for attachments that will list which backhoes fit your tractor.
You could use this backhoe on your tractor, but as others have said you could go with a larger one. I have a 4530b and use it on a L3300. It is fine for what I use it for. It really depends on what kind of work you plan on doing.