Have just ordered 2 sets of self adhesive sail numbers for 1728 (scoured everywhere for sails with the same nos to no avail!!) and got the sets from Kyospruce for about £12 delivered (that's about half price).  They don't do logos however but generally it's the numbers you need. Blue, red or black 12" lots of other bits.  Thanks to CVRDA for putting the info my way