A question that you had in your original post... MC DOES STOP making seat covers for the old boats. I am not so sure it there is a time limit or it is just up when they stop making that boat/seat size and style anymore. Almost all re-covers are done aftermarket. It is rare that you find a re-cover with factory skins. They are out there, but hard to find. So no real worries that the boat has non-factory skins.
1996 Prostar 205 LT-1