Have you checked with a Jinma dealer? There are several good ones online. Ranchhandsupply is probably nearest to you. Also Affordabletractor and circlegtractor come to mind. You may have to buy an entire end plate to get a new bushing.
What engine do you have? The dealer will need to know.
Most online catalogs only show complete replacement starters, no internal components.
If possible, I would look for a local repair shop that does starters. Some NAPA stores will work on starters or alternators. Other local automotive stores in your area may be a good place to start.
Failing that, I would see if I could press out the old bushing and then check with a bearing supply house to see if they have one or can at least order one. You are more likely to get the correct size this way because even the same starter number may have different internal components from one starter to another. When the manufacturer is not selling internal components they are less likely to be concerned about design changes as long as the finished product will bolt up.
Yes I should have put more tractor info. It has the Yangdong Y380T engine. The starter started making a weird grinding sound. I disassembled the starter and I could see where the armature was making contact with the field coils. I was hoping I could just buy one before I fired up the lathe because it needs a new chuck and I don't have any Oilite stock. Thanks
Yep, that's a goner. The reason for asking about the engine is that these tractors may not always have the same engine, and there isn't model years like automobiles. Different engines will oftentimes have different starters, also why serial numbers are important. Not all tractor owners are mechanically bent and adept with tools, so may just choose to replace rather than repair.