When looking for a seat there are a few things to know. What shape seat are you looking for? We have a number of shapes which are oval/round, d-shaped, square. Do you know who made the pan and what range it is? If you know who made the pan i.e. Ideal Standard or Duravit and the range this made life easier as you can filter by these to show you seats which should fit your toilet pan. Soft Close or standard close? Soft close toilet seats include a damper on the hinge to stop the toilet seat and lid crashing down on the pan where as the standard close is just the hinge.