The other ring I have says RH. The right hand unit that you have in the pic has the red and green wires on the right way so other side needs to be reversed. I can't remember which, but either both red or both green need to facing the front when on the car.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)