Jennifer, When you order new sails be aware that early vintage M15's have a shorter rig than the current production models (19'-6" vs. 20' as far as I have determined, see http://msogphotosite.com/M15mastmeasu.html). Stock sails may not fit older boats. I bought a new set of "stock" sails from Elliot/Pattison Sailmakers for my '85 M15 #319 (Main: Slugs, Loose Foot, 1 reef, Standard Jib). If any sails would fit an M15, theirs would have, right? They didn't fit, both sails were too "tall" to hoist. Harry Pattison was VERY willing to re-cut the main, even offered to take the stock jib back and make another one to fit. I decided to alter the old mast and rig. I wanted the published M15 sail dimensions to fit my boat from now on, I didn't want to deal with this issue again. I sleeved/TIG welded an identical 6" section to the top of the mast, added a Race-Lite RL-425-H Hounds (from DuckWorks http://www.duckworksbbs.com/hardware/rigging/rl325/index.htm it's bolted thru the existing shroud holes and raises the position that the forestay attaches to the mast by 4-5"), and had a longer forestay made by West Marine. It was a lot of work, but it turned out perfect. Your best bet may be to measure your old sails, or follow the measuring instructions on the Sailmaker's order form. It was my experience that stock sails did not fit my '85 M15. George M15 #319 San Jose, CA