Call Corey at evolution covers or Paul at Bakes. Cory must have your pattern because there is a picture on his site of a PROV with the tower you have. Bakes makes custom covers as well but not sure if they will have that pattern. In the past they were a Malibu dealer so thtat may be most of the patterns they have. That boat was pretty popular in the Seattle area in 02-06 so they might have it.
Either way both should be really high quality, subrella covers with no straps other then the transom straps ans are towable.
http://www.evolutioncovers.com/
http://bakesonline.com/boatcanvas.aspx