Mirror Extenders

I've put a set of these on both of my bikes and I really rate them.
Depending on your size, standard mirrors offer a great view of your own shoulders but not an ideal view of what really matters.
These extenders site the mirrors a bit (about 20mm) higher and more importantly wider than the normal position which really makes a big difference to the rear view, especially on motorways.
Pretty easy to fit too (once you've worked out which mirror has the left-handed thread!)
Got mine from Ebay via MC MotoParts - shipped from somewhere in the Far East and both times have arrived inside a week. All in, about £15 ish, around half the price I've seen some UK dealers selling similar items for.
Well worth the money in my opinion.