No need to use terms like port and starboard. Most of the public don't know these terms.
R is R and L is L in Bmw catalog book, and viewed from the cockpit.

In healthcare, the nurse or doctor facing the patient refers to the patient "R arm" as the real right arm.

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT