SC19 and the SC17 use the same mast, except there are diamond wires on the 19. You could probably get by with a 17 mainsail, but you'd loose some sail area and the foot might be short. There are some 17 sails for sale on Thebeachcats.com
You can gets anything you need from Aquarius. Their costumer service in top notch!
Last edited by Mac McCallum; 08/13/15 11:53 AM.