An inter-net search I made a year ago turned up factory replacement seats for my victorian style Incepa toilet for approx. $265. Discouraged, I modified an elongated seat but it never looked right. The sources in the *** **** posts were all located in Canada and were very expensive. Thanks to Bemis Mfg. Co., I was led to Bemis Bath Shoppe, 512 broadway, Sheboygan Falls, WI 53085. They have the exact Laufen, international size seat. (Half way between round and elongated)
Their L-1800 seat will cost you less than $50, including shipping.