I haven't done one either and probably won't since I have a Tip. (I'll just replace the motor if it goes)
Having said that, I've done some research on it, and the European Parts Solution makes the most sense to me. It uses an internal oil feed modification, and roller bearings. It costs $579 - $739, depending on motor. The one for your motor should cost $579.
https://www.europeanpartssolution.com/ims-bearing-upgrade-kit
The IMS Solutions bearing is a plain bearing similar to a rod bearing and has an external oil feed modification. It costs over $1800.
They both have 5 year warranties. They both claim to be permanent bearing fixes.
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