I am of the belief that the only difference is bolt rope as opposed to hanked on, there is also the options of foam luff and UV protection but otherwise I believe sizing is similar
I'm having a new 135% Genoa made up which I am to believe is in between a no1 and a no2 so the sizing is different but once it is measured when the furler is on I will get the sizes off him and put them up for everyone
also if anyone is interested I saw these sails in my searches, I think they would probably fit but I've gone with a more expensive option
http://www.allmarine.com.au/shop/yacht- ... 5ft-yacht/