Captains choice parts question for 525sc
 

I have a 98 fever with a 525 sc with captains choice exhaust. Apparently the internal parts blew out of exhaust on the port side. I need to know where to get the repacement "flaps". I need the diverter plate, bushings, and screws. The captains choice is made by Mercury Marine. It is 3 3/4 " inside diameter.