Is this what you're referring to?

B.4.1. MAINSAIL

B.4.1.1. [color:"blue"]The mainsail shall have a surface area of maximum 17.00m² including the mast.
[/color]
B.4.1.2. No part of the sail shall be above the upper mast band.
B.4.1.3. The aft head point of the mainsail shall not be above the head point.
B.4.1.4. Maximum Upper width at upper leech point 1500 mm from head point : 1290 mm
B.4.1.5. Maximum Top width : 1000 mm
B.4.1.4 & B.4.1.5: Sails with larger measurements can be measured and used until 01.01.2009.

And in reference to the mast:
[color:"blue"] B.2.1. MAST
The perimeter of the mast section shall be a maximum of 385mm. [/color]

Jay