Does anyone know where I can get a reasonably priced boat cover for the 1998 Mobius, with a tower, and that covers the swim platform?

I did find one at, but the only cover that works for the tower and swim platform, is one that fits a 2000 Mobius/Kanga/Outback. It sells for $311.95. Do you think the length and beam of the 2000 model would be similar to the 1998?