Looks like we've been here before but assumed that some previous owner had fitted a Sports Classic headlamp to an S2R.
Slob alludes to the part number for the shell being for S2R and SC1000 in post#2.
Would it be reasonable to assume that this odd headlamp became a standard part across the range when the SC came out?.. And why replace an already bizarre headlamp with something even weirder?
http://www.ukmonster.co.uk/monster/s...ntify+headlamp