Bidet Compatibility Tool Bidet Compatibility Tool Enter the dimensions in millimeters of your toilet pan to see which bidets are compatible: A Measurement: The A measurement is from the front of the pan to the front of the cistern. B Measurement: The B measurement is the distance between each centre of the bolt holes. C Measurement: The C measurement is the distance from the front of the front edge of the bowl to the back edge. D Measurement: The C measurement is the distance from the front of the pan to the bolt holes. Results: Error: Unable to read CSV file