Most toilet seats are fitted using two hinge holes at the back of the pan, but shapes and sizes can vary. To check compatibility, measure the distance between the fixing holes, the width of the pan at its widest point, and the length from the fixing holes to the front edge. Also note whether your pan is round, oval, D-shaped or square. If you are unsure, bringing these measurements to our Daventry showroom can make it easier to compare options.