Inspired by Redratbike's post I did a bit of surfing and found a cheaper alternative to the oem seitenblinkers, the Autobianchi equivalent -
http://www.ebay.co.uk/itm/Nos-Autobi...item3ce624659f
They don't look as if they'll be
quite the same quality as those from Germany, but they're not far off and will look the part, so at less than half the price, £31 delivered, I couldn't resist ordering a pair for the parts shelf.
They're coming from Greece and are new, old stock. Great vfm, Vive la crisis economique!