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Doug Mills Canvas is great but I just bought a cover from ENDURAcover custom made Supreme Aqua Shield for my 150 Montauk through iBoats.com you pic model and year and within a week you have a cover.and I'm very satisfied with quality and fit and as the cover has a draw string embedded all the way around the topsides that can be tied off at (under motor) the transom it is a great mooring cover and includes (one part) a cover for the OB.
No need for hooks your rub rail keeps cover from sliding up.