I'm trying to minimize deflection in the rear suspension. I think the part you linked (W63400) are the 4 trailing arm bushings, which I've already done.
The part I linked appears, to me anyway, to be 2 x 2-piece bushings, for the same application as this powerflex part
https://powerflexusa.com/bmwe81e82e8...-pfr5-415.aspx. You can see in their diagram that this would go at the inner "spring arm" attachment point circled in red.
The diff and subframe bushings are all polyurethane. I've also installed adjustable rear toe, guide and wishbone arms.
So at this point that bushing at the camber adjustment eccentric bolt is the only remaining OEM rubber bushing in the rear, and I'm wondering if it's detrimental to leave a singled mismatched bushing pair in there.