The bellow boots also don't last long if you install the halfshafts with the "thing-that-subs-for-a-u-joint" in the outboard position, because that lump seems to be bulkier and gets closer to the hot exhaust pipe just below. The axles are normally symmetrical so you can mount them either way. With the heavier end near the ZF, the unsprung weight in the rear is also fractionally lighter for theoretically better handling.
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