I've just taken delivery of a set of these. They're assembled from the manufacturer and filled with 5000 front and 2000 rear Ultimate oil. Their journey from Finland to Denmark did not present any leak problems. Bearings are included. No manual, so you're a bit on your own if it comes to disassembly, but if you have ever build geardiffs before, you should have no problem.
The diffs will be tested this weekend as they were delivered. The test will be on a fairly bumpy high grip carpet track - basically the biggest punishment possible. The track is known for killing off rear (ball)diffs due to several fast, on-power corners, so this will be a good test I reckon.
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