Without fail, owners of older Saabs will have faced the same problem, want to hold on to the super cool looking OE stereo but have no simple way of connecting their phone to allow for all you favourite tunes to blast out.
Endless hours of research always pointed me back to one solution, the CD Connect Aux function from Skyddet in Sweden. It a simple little gadget that replaces your CD multi changer connection, it's all totally invisible besides a discreet 3.5mm Aux jack that can be fitted to a black button on your dash somewhere.
After fitting one to the Viggen, it works beautifully; sounds clear, crips and loud, pretty much all it needs to do, however, it doesn't offer any control via the head unit besides the volume, which is a shame, but a small price to pay to keep the Saab looking sweet. Not cheap at £180 but highly recommended if your Saab aesthetic is important to you.
CDConnect Aux | Skyddet Sweden