U1631 appear to be stock at Schumacher. I think they're from the Big 6. You might need to dremel the front suspension uprights to use them. The disadvantage is that they shorten, and therefore increase the angle of, the driveshafts. However, there is no need for an M3 nut as the whole thing is a plastic locking nut... so the diff never comes undone.
The bearings I have are Abec 5 ceramic hybrid with nice blue seals (spot the front axle crush spacers)
