Making Prosport seat wider?

[Racer42]

Has anyone had any luck making a Prosport seat wider? My seat is only 15” wide at the hips and I am 17”. I am looking for used seats in the US but haven’t found one yet. I know Arc Angles makes them but shipping is twice as much as the seat. I am considering cutting the seat down he center and re-glassing it, but I am concerned that it could harm the integrity of the seat. All ideas are welcome.

Thanks