This is not a generic mass produced cover. This is a custom boat cover, measured and designed specifically for the Zodiac Yachtline 340 Model yea 2003 to current. This cover will cover both two stroke and four stroke motors in mid motor position or level with the deck. Our covers feature an elastic shock cord to ensure a taught fit. When installing the cover, make sure the inside tag is at the stern. Cover comes with several tabs on the bottom in order to secure the cover from underneath when necessary.