Replaced the toilet fill valve and flush unit. However the toilet seat was cracked needed replacing. This is the old toilet seat which I removed. Cuskmer got this toilet seat from screwfix which I included in the pictures. It don’t seem to fit and be the right one. Am I wrong in assuming all toilet seats would fit ? If I’m wrong could someone point me in the right direction we’re I can get the right toilet seat for this as the old one is now off