300/440/550 Fiberglass Cap Needs Replaced

My buddy and I just bought a 1989 550 Kawasaki stand up. The back cap on the hull where you put foam in is cracked badly and needs replacing. We don't know where to get one. It isn't the fire extinguisher one it's on the hull.
 
huh?????? pic??? lower hull extension in the back? grind out crack & epoxy resin with angel hair mabe, but i dont know what you are talking about. post a pic of the item you are talking about & that will help
 
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