I have sever cracking around the mounting holes on my Kubota L35 rear rim. I am worried that it will fail at some inopportune time. I have spent hours trying to find a used rim with no luck. Is there any model Kubota tractor other than the L35 that uses the 15X19.5-6 Rim (p/n 32751-50830)? I know I can purchase a new rime but need to pursue this first. Thanks for your help!