454 Exhaust Manifolds

I just bought it last fall its a 95 Supra Sunsport and has the PCM 7.4 HO. The gasket between the manifolds and risers were leaking going back to 2 owners before me the previous only owned the boat a year and a half. Anyway the water that was leaking down the outside was running onto the rear 2 ports and rotted the runners out before they enter the water cooled section. When I winterized it and shut the engine off after fogging it I noticed a small stream of smoke rising from the port manifold. When I got down om the floor and looked at the bottom of the manifold there was a hole that I could stick the straw on the fogging spray through. Front runners on both sides were good but both rears were eaten up from the tilt of the engine running all the water that was leaking onto them. I've looked at the manifolds on skidim and will go that route if I can't find some good used one's. But wanted to see if I could find some good used one's first with all the other money I've spent getting the boat and equipment for the summer. Thanks

I'm needing a set of pcm 454 exhaust manifolds if anyone has a set. My risers are good just need the manifolds.