THANKS!!!
Hello,Thanks for all the information. Brett - I think you solved the puzzle. The 58" circumference corresponds to standard, 23.6 distance between the center of the wheel and the drive unit. It's also the standard belt shipped with the unit. Now I can order one from West Marine. The problem I had is that no one locally stocks the belt, so I can't bring my old one in to be matched up. If I were at the boat I could measure the distance from the wheel to the drive unit, but I'm not at the boat!Thanks again, Barry