What part of country do you live in I ask that because there is a company in California that can make you a Denso style gear reducted starter to replace yours, in most cases you have to send them your drive in housing and clutch to be exact match depending where your located I can help you find...
If you can a picture of Denso part number 128000-8460 starter some locations list that as a replacement and as someone has already stated alot of the Japanese brand will interchange this by the picture calls for it fitting a kubota.