I have a 2002 Rinker Captiva 232 Cuddy that I'm installing a RayMarine Dragonfly unit on. Clockwise screw on a 5.7 L Merc. The transom is 8' wide, but there are trim tabs installed. It is 9" from the centerline to the starboard trim tab (book says mount on stbd side), then the tab is 10"...