Hey Bob - I did some more hunting and I found part 55558606. Description appears to be a fit for the second hose. What do you think.Is the car running? If it's "down" and you can pull the hoses, you might still find a part number on them. Saab, unlike a lot of manufacturers, puts the actual part number on them.
If 31 was part of the PCV system, that might explain why it went out of style.
Looking at eeuroparts I had initially thought the same, then I checked the part info and it looks like it was used on a limited number of 9-3s also:From the EPC that looks to be a 9-5 part, which means it would be for a 2.3L motor.