I make my own from scratch (Sailrite prices are outrageous) so I can't say for the pre-patterned ones. You can always measure your boat and ask their dimensions to see if it will fit yours properly. There are other considerations here...do you want a zipper, twist turns, bungee cord and/or ties? My personal choice is twist turn fasteners instead of a zipper, tie straps/cords at the ends and twist turns along the bottom. bp -----Original Message----- From: Rick Davies <jdavies104@gmail.com> To: M BoatsForum <montgomery_boats@mailman.xmission.com> Sent: Tue, Mar 12, 2013 7:30 am Subject: M_Boats: Mainsail cover Spring is here (almost), and I'm thinking about a mainsail cover for Lynne L. Does anyone have any experience with the pre-patterned cover made and sold by sailboatowners.com? Do they fit well, what's the workmanship like, etc. Any help would be appreciated. Thanks, Rick M-17 #633