I have a '78 Oday 25, swing keel, with a broken rudder. The blank that I purchased to replace it does not appear to be the same exact dimentions as my old rudder so I need the rudder dimentions to finish out the blank as I only have half the old rudder left. What I really need is the overall length and width at the base of the rudder. Anyone out there with dimensions, a drawing with dimensions, or a template I could purchase?