0:00 The issue
0:49 What to buy
1:23 Dissasembling the original key
2:04 Soldering the buttons (if required)
4:03 Reassemble the key
It is very common for Saab keys to be affected by heavy wear, sometimes to the point that the buttons themselves are damaged or even missing.
Here is a quick guide on how to fix this for £6.99
https://www.ebay.co.uk/itm/303202555083
you need to press in the saab logo on back of the case to remove the key easy ..