Just had this problem. The hose going to the inlet of the AIC had completely perished. Tryed lots of different places and was told that only SAAB would be able to replace it. Instead I went to the local scrappy and found a piece similar from an old Peugot and cut it down a bit, perfect! Only cost a pound with a new horn from a BMW 5 series too! (Much louder than the OE ones)
Hi. Was also told by most people that I had to get oem from Saab bue to the bends in the hose. Anyway, eventually found a hose from REPCO (Australia) called Premo Flex multi purpose 1/2inch hose. I was told it is made to withstand the recomended pressures, temperatures and exposure to oil. It was tight getting it on but seems to do the job.