Hi In my E46 2001 318 se coupe I have been getting an intermittent warning light on the dash showing the offside rear brake light is not working, some days its fine, the next it shows a fault,

Today I have been out to the car and done some investigating and have been looking at the side/tail and the brake light bulbs

Both inner ones which come on as side/tail lights appear to have twin elements but only work as side/tail lights, which means that the second element is not required is this corrct or has somebody put in the wrong bulbs?

The outer ones work as side/tail lights and brake lights. but even then the bulbs dont seem to fit very well!!

Can somebody help me clarify which bulbs should be installed. and if possible even give the bulb part numbers.

Many thanks