This B box with 2.58 to 1 gear ratio was removed from a rotax 503 on a buccaneer xa ultralight in very good condition. The gears have around 50 hours on them. The cases and prop mount are in very good condition. I’m currently installing/experimenting with a 4 stroke on the aircraft and no longer need these parts. I’m parting the entire engine. If any other parts are needed just ask. This item comes as pictured.