What Kubota diesel is in a Walker Mower?

Just wondering if you guys knew what a lil' diesel Kubota in a Walker mower would be, as far as a model or series number goes? I've got a 1998 that needs a new starter pretty badly, and I'm debating just looking for a new or reman off of e-bay? I don't remember what my dealer wanted for a new one, but I know it was a very high dollar amount.

Thanks in Advance!