Ive had 3 lucas brake pedal switches since Ive had my TR7, they are fitted to numerous BL cars and they are aboslute plastic rubbish! they don't last, you have no confidence in them, you are always checking you brake lights.
so today ive done a bit of internet digging, and measuring and I have sourced a much better made replacement, steel construction and the same 12mm thread so will fit straight into the bracket.
The part No is 464110010 manufactured by FAE and fits BMW cars and can be purchased from Europarts.