WIth your loader having no decals, and what appears to be not the original bucket, and some different cylinders (color anyway) I think getting accurate dimensions from someone here is going to be tough, unless you can say this is the Kubota Model XX01 loader and tractor S/N of XX12304 made in 1988 for example.
That said, It does appear to be a kubota loader (the tank on the right side is for Hyd Fluid) and the arms may be kubota, but the rest of your machine has sort of been "put together" it seems.
My suggestion would be to get someone in GA near your tractor (like a neighbor) to measure the center line between the arms and the pin diameter, as those are the critical dimensions. The pin placement for the top and bottom connections are important but you have more leeway in those than the others.
The problem is, I dont know people in the area enough to leave a key to my shed, where i keep the tractor. And it is a 650 mile trip 1way. I was hoping to get measurements to make the brackets. So I can take the bucket with me when i go next week