I've replaced these in E30 and E36 they are pretty easy and cheap. Why not just try it. I've also replaced the center support bearing at the same time (in the exploded image about mid-driveshaft).
Have you inspected engine/transmission mounts?

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1988 325iC Project - RESTORATION FINISHED!!
Build Thread: http://www.r3vlimited.com/board/show...ht=325iC+paint
2001 X5 3.0 - 2001 M3Ci - 1988 325iC