I realised today that the seal around the rear lights, where the drainage around the trunk runs over, has perished on both sides of my car. Right side is worse with a substantial gap missing. I definitely don't want to chance rust or failed electronics so I need to fix it.
So how can I fix it? I'm hoping it's just a new seal rather than the whole lighting fixture. It's a BMW E46 330Ci 2002 with the sport package. Pre-facelift I believe.