Probably done already, but will post anyway as I have a detailed how to which some of you will want to try.
Rear fog lights. I say who needs them? However, in UK, you will probably fail MOT if you don't have them?
Does get foggy here in Canberra, but I saw more use in creating dual brake lights.
The attached mod works for just about all BMs. I first did it on a beautiful e21 coupe, but the car in the attached was a nice e30 323i I used to own.
My current car is the e36 above and I did the same mod when I purchased some aftermarket clear/red tail lights.
If MOT is a problem, I have included instructions on how to install a switch in the boot which can be used to turn off or on the dual brake lights so that you can demonstrate that the rear fogs still work.
If you have any questions pm me.