I had a similar problem with my Kubota and ended up finding what I needed through local dealers and farm equipment auctions. Maybe you could try that too?
For the gear issue, maybe a shop that fixes machinery could help, or they might make the part you need. If you're thinking about welding, that's a big job and needs a lot of care.
I bought my Kubota from Wickham Tractor Co. They know a lot about parts and how to fix things. Maybe they can help you find the part or suggest what to do next. Here’s their website: https://www.wickhamtractor.com/.
