The first one I had was like this, the second one is more like a square box and I think is better as with the old one my mare could work her way to the side of it and eat loads I would be careful as I think you could end up and split it if you try that.
Thanks for that..... didn't realise when I bought it (2nd hand) that they were different
I'm guessing they must work for some though as I used to have one for a laminitic Sect A and that worked a treat. I just don't remember it being flat at the chin end though 😕