Lol, he's a gonner.
It boggles my mind why people have to make things complicated. On average, our asses are more or less similar in size right - so the average toilet seat should have standardized fittings. I'm sure it will last long enough. Definitely not the kind of thing that you want to have to replace every year.
I blame the americans and all those oversized asses that have meant seats have had to change! :OD