These rings are the same for front and back doors. P/n 201-192-12-05. They are listed as available for less than $2 each through a number of I-net vendors I checked. Why not try the forum sponsor first? Your local recycle yard may be a possibility too.

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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