Probably not a lot of businesses specifically building Perkinsexhaust elbows modified for a particular Beneteau model of boat, but most likely a lot of independent welders and machine shops who could build one based on the existing one or a good drawing of such.
Here are the elbows (two engine, generator and two connecting pieces). I don't have a pic of them installed and right now the engines are a bit unaccessible to get a pic of them installed.
Mark
On the VP D1-30 exhaust elbows you made from Schedule 80 stainless steel pipe . Do the water injection pipes just go straight into the exhaust elbows, or do they extend into the inside diameter in any way?