I ordered this cover from Amazon even though the given dimensions did not match my 2011 MES 40 that I purchased last weekend. Well the cover arrived today and I am impressed. It is very heavy and fits like a snug glove. There is no way this cover will blow off, line up the metal cover plate that is attached to the cover and slip it on. Ignore the dimensions given they are not accurate, order the large version for the MES 40. In my opinion it's a great value for $20.00 Anyhow I thought I would share in case anyone was in the market for a new cover.