I actually got the light duty bucket as a gift. It had such a huge smile in it the owner went and ordered a new HD bucket. Had to cut the side sheets both off and then lever the bottom on a sawed off log with a ton of down pressure to get it straight again. Actually came out good and I'd never recommend any 'clamp on attachment, pallet forks, spade or even a clamp on ball hitch on a light duty bucket.
The issue is, once you put a smile in the bucket, it pulls the side sheets in and the only way to get the bottom straight again is to remove them from the equation. No matter how hard you try to straighten it, you cannot and a bucket with a smile in it is useless for about everything.
One nice thing about having a SSQA attachment on your loader is, you can fit any bucket, don't have to be a Kubota so long as the bucket has the mating SSQA plate. Both mine do. One is an ATI and the other is a Kubota and candidly I like the ATI better. It's much more robust and the locking arms are as well.