heater duct

Looking for a pair. Mine are cracked with missing pieces. Any help would be appreciated. Thanks

I am looking for a supplier for the heater duct hose. Goes from the heater to the defroster nozzles. I have not been able to find a size that will fit at my local auto parts store. BMW says that it is unavailable and cannot tell me the size. Does anyone know where to source this? Or if not...