At replacement toiletseats.co.uk we have sourced a range of universal replacements for non-standard toilet pans. 

When considering seat measurements please note that these should be taken from the toilet pan rather than off seat.

These measurements should be for

Length - centre line of the hinge hole to the front of toilet pan

Width - At widest point side to side

Hinge holes - Distance between holes assuming mid hole to mid hole.

Manufacturers normally display measurements assuming this