Want To Buy: Seat for Aquapro dinghy (7')

[Between Friends]

I'm looking to buy a replacement moulded plastic seat, new or used, for my 2002 Aquapro rigid aluminum bottom dinghy. Model #SMR901-9392-WED (max 5 passenger / 450 kg). It's about 7 feet long. I'm having trouble finding a dealer in Vancouver BC, or anywhere in Canada for that matter.
Or, does anyone know how to repair it? A heavy person fell onto the seat and made a horizontal crack in the plastic between the two pocket hole openings to the inner shelf. The seat is now tending to collapse a bit when you sit on it.
Thanks