I noticed one of the sidelight clusters had a chunk taken out of the edge. It seemed structurally sound, but both seemed to be a bit green inside, so I decided to change them.
It is easy enough to get them out, and the drivers side is fiddly to get back in. Luckily someone on Saabscene had suggested tying string round the clip, and that did the trick.
Old and new sidelights
Old (orange) and new (silver) bulbs
Easy job to do, now the headlights just look old ;o)