MD11C Exhaust Manifold
I recently had the same problem and could locate an exact match for my MD11C in my Pearson 323. I ended up making up a new one from a bronze T and some plumbing parts purchased at West Marine. The only tricky part was to drill and tap the bronze plug inserted into one side of the T to accept the water input. It''s been in the boat now for about 5 years with out a problem.