Finding the right bulb size for the 2008 Saab 9-5 tail light, is like pulling teeth! The bulb I have is a GE 1077F 12vp21/5w but the local shops do not have this bulb and a standard 1157 that I had laying around works but the display shows the bulb is out. I know this is because the bulb is a different resistance but can't find a proper cross reference for the tail light.
Any help on a bulb size or chart for cross referencing, would be amazing!! thanks in advance!