I realise it's a long way off, but Caley Marina (inverness) engineering dept seem to have good access to spares. I got a collection of gaskets pretty promptly by post. They are also fairly knowledgeable about small Yam . 2 strokes.. Worth a call? or email?
I've just, a couple of days ago, had a bunch of spares for a Yamaha 2B from Craig Neilson of Lymington based BHG Marine Ltd, 01590 613600, or craigneilson@bhg-marine.co.uk. This was based on advice from a previous thread here. They seem to cover everything, prices are good, order delivered within three days.