On the 6 the cover replaces the fog light, i.e. you either have a cover OR a fog light, but not both. Ralliart sell the covers and the bracket that fits in place of the fog light. I don't know if anyone actually makes a cover for a fitted foglight.
Go to Halfords...get the clear covers for a mini...about £15 a pair...DUN!...fits E5 spot-lights perfectly.
E-mail me if you want a near perfect cover for the headlights on a 5....also from Halfords UK