Steering Clutch disk diameter

[GraderDan]

Lavoy, have a question about what is the correct disk diameter for a 1010 and what is the disk diameter for a 420?
Also, when we pulled the steering disk out of the right side of the 1010, the seal had leak and soaked the steering disk, the inner 3 disk had the centers chewed out of them, on teeth left at all, what would cause this do you think?
Thanks, Dan