The parts manual really wasn't much help, but thats where I always go first.
Can you see the driven gear? maybe mark one tooth with white paint and count as you rotate?
The newer transmissions use a round adapter for cable gear, you can rotate it around so a range of gears will fit one adapter. If yours is a fixed piece, then you and Denny are correct, and only one gear fits each driven gear.
Good luck in your hunt.
Joe
