does it look like this manual? I know the pictures are pretty bad, but you should be able to use the schematics and drawings to confirm if this is it or not.
If you can, some pictures of yours would be helpful. My bucket was modified at some point in its life, and i would like to figure out what the correct width bucket is. This has been cut down to 36" width, and the tractor wheels are 41" wide, so this makes it just about impossible to dig straight ahead and keep the bucket level. The only way I have found to dig level is to dig in a curve, so the front tires are always on the fresh dug surface, So I dont make 'scallops' in the new surface. I believe the previous owner (farmer) made the bucket fit down into the cow muck trough, so it would scoop clean. Unfortunately finding details such as this are difficult. I am not even sure how the original bucket was attached.