Since your car is a later 2007 model with the newer regulator style (which I see there isn't an option for under the 2007 model year), I wonder if the 2008 is the same one that you have. eEuroparts does have a listing for the 2008 model and it's in stock. It's a little pricey at $167 though.
I think the 2008 is the same as mine. I did get the part from eeuro but they are just junk. They are the Propart variant which die within a year. Have gone through 3 in the last 4 years. I would prefer the original "used" saab!