Volvo Penta Cylinder Head

[MaxPower43]

I have a Volvo Penta KAMD 300A engine which snapped a valve and wrecked the cylinder head. Volvo tells me they cannot supply a replacement head until end October. Does anyone know where I might find a new or used head for the KAMD 300, KAD 300, KAD 44 or KAMD 44 engines (which I believe all use the same head)? Volvo part numbers are 3803543, 3583105, or 3803309.