Manifold/header/muffler/tail Pipe Problems of Cadillac Fleetwood

I am owner #2 of this vehicle. The manufacturer discontinued making the intake manifold for the vehicle. Cadillac dealerships claim there are no nos parts, the main aftermarket manufacturers do not make replacements because it would not be profitable to do so. The used part recyclers in my area either do not have the part or misrepresent the part claiming it is for a fuel injected engine when it is clearly for a carbureted engine. This is bogus, the car runs beautifully, or did until this occurred, and now because I cannot get this one part, the car ends up in a junkyard. Pitiful and wasteful, shame on gm/Cadillac.