Well one of my friends has a Saab and he tried to install some extras. He bought those parts used from a company which is doing business only with Saab parts.
He quickly found out that Saab made significant changes through out the model year.
In his case the complete wiring is from the next year model which was released a few months after his car was build.

I know this won't help you but it could be that some of us might be will disover a big surprise when it comes to parts just as you did.