There is a guy selling all 4 window regulators from a 1983 300CD. I only need the driver side rear. The guy selling them can not tell which is the left or right side regulator (nor can I) other then me pulling out the one in my car is there any way to tell them apart ? Possibly a part # difference or some easy way I can tell the guy which one to send me.
Thanks in advance

Left rear window regulator p/n: 123-670-15-03
Right rear p/n: 123-670-16-03

Visually, I don't know how to differentiate the 2 rear window regulators from each other, but the rear regulators are smaller, more compact than the front window regulators.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't