Itīs reverse light switch. And it is 01E. There are different length and spline main shafts. My 4 cyl 016 has same 24 spline as mk2 Golf 020. 01E (and possibly later 016?) has Audi 23 spline. My 016 has same length shaft as 01E, but some typ44 transmissions have longer. Guys at MG will know this better for sure.