Hi, Jose
The early Intrepids had a 5/16″ diameter pins holding the removable rear bench seat in place. As time went along the seats got bigger and heavier. It’s more likley your pins are 3/8″. You can measure to confirm.
The length of the pin is 2″.
It’s a heavy duty push-button quick-release pin that locks itself in the reciever. It’s removed by pressing the button at the top of the pin which allows the balls to retract so the pin can slide from the reciever.
You can call the factory (727-548-1260 x242) to source them.
McMaster Carr has the same thing, p/n 92384A576.
Happy Boating!