Looking for final drive

[PJK]

We have a Mitsubishi Trackhoe that the final drive went out of on the track.
My husband bought this machine new in 1988 so it is an older machine but runs great.
We cannot find the sun gears or planetary gears to go in the final drive.
Mitsubishi sold out to Cat the same year he bought the machine and Caterpillar carries some of the parts but not the main components?
The model number is ms120 and was hoping someone might know where we can get the gears?

 

[lens12]

We have the capability to cut new straight cut gears. Either by make the whole gear or by grinding off the old teeth, sleeving, & cutting new teeth. You can ship us the parts for an estimate.