I'm sorry, I didn't know what you meant by ears until I googled it. If the ears were cut off from the back of the 24" Case bucket and welded onto the back of the non-Case 38" bucket, it might work but I'm not sure how the welds would hold up. And the back of the 38" bucket is much shorter than the Case bucket so it would take extensive modding. And the bucket would have to sit level. You don't want to dig graves with a crooked bucket. I'm not sure it's worth it financially to try it. The ground at our cemetery is mostly hard clay and rock, so there's a lot of stress put on the bucket. We are a nonprofit cemetery and were fortunate to have an unusually good year donation-wise to buy the backhoe.You said the dipper was different on the 590SL compared to the 580B. I assumed you were trying to get the bucket to fit the machine?