'BIKE IT' F1-style carbon look mirrors from Demon Tweeks
www.demon-tweeks.co.uk are superb- weigh nothing, look like carbon from a distance and fit in ten minutes!
Adjustable via a ball & socket joint which was still bit floppy after I tightened them up as tight as I dared; I'm going to put a bit of copper grease on the thread (so's I can get them tighter without stripping the threads) of the ball joint cap and a smear of loctite on the ball- should be fine then.
at £21.45 delivered to my door the next day, I'm well chuffed with them!