Melted hull through exhaust leaking water, replacement parts suggestions?

[Fisherman302]

Hey guys first post here on the forums, to make a long story short I noticed boat was leaking extremely bad it’s a 2005 moomba Mobius LSV, found the problem was the plastic hull through exhaust was leaking. Took off the 90 degree elbow underneath noticed it was soft and warped and the plastic piece it clamps to was warped and melted. (Pictures included). Is there anywhere to order the oem parts online rather than going through a dealer? They said over a month to get the parts and they are over 4 hrs away from me. And that means my season is over. Could I go with some aftermarket parts? Pics included. Anyone that can shed some light on this would be greatly appreciated. Thanks! Also why do you think this happened? Is it a common problem or did the boat overheat causing the water in the exhaust to melt everything?