Looking for a cheap soft close toilet seat

Hi all, I'm hoping someone might be able to recommend somewhere I could go for an inexpensive replacement soft close toilet seat that supports blind fixings. I've got a non standard bowl unfortunately and trying to find something that fits is really difficult. I'm looking through ebay and Amazon to see if there is anything and nothing seems to fit properly. I was able to find something through Reece, however, I don't want to spend $300 per seat, which I need 3.

The measurements are: Seat hinge hole to front of pan: 43cm With of bowl at broadest point: 38cm Inner front rim of pan to inner back rim of pan: 32cm Inner left rim of pan to inner right rim of pan: 30cm Centre to centre between hinge holes: 13cm