The rh axle bearing is a roller/self centering type cuz this side goes through an arc and the pivot is under the C/L ... so , without this, you can get knocking, specially going around a right turn with negative camber..
The left side does not need this as the bearing and axle are always fixed to the outer tube/position..[ i.e. - they swing as a unit with the whole diff case]

But , I have seen guys replace it with the standard ball type. mostly due to cost and the roller is hard to find. [ SLS has them] without problems.
I would not do it myself.

Anyway, I think someone may have replaced an axle at one time .
The reason I ask about the circlip [ you do not have ] is cuz on those all axles were same size. That would be 280 version , I believe..

What does your comment about 108 mount refer to???
..and what is the problem with the rear?????