Any Volvo Penta
dealer will have them or can get them quickly. Or do what a lot of us do and get a good local welder to make one out of stainless. Don't try to copy the design exactly. Just weld an elbow
to a flange, insert a raw water
injection port down the elbow out of direct line to the exhaust
outlet and make up a short hose to connect the raw water
boot outlet to the new exhaust injection port.
It will cost half as much as the VP cast elbow and last twice as long or longer.