Having rather foolishly broken the existing Alto seat by standing on it to fix a bulb (Doh), I decided to replace like with like. The new seat is of the same basic shape which is what I wanted but there the similarity ends. The new design is far better than the old, ensuring that the fit is better and more secure. Also instead of just 2 points of contact with the porcelain it has 4. Also came with a very useful tool to aid the assembly. I would still not recommend standing on it but do wonder if the new seat would have broken like the old one did. Recommended.