A quick way to see if a S124 is equipped with a third row seat from an advertisement picture is to look for the seatbelt just behind the "C" pillar. Most pictures will show that, or the absence of it. Retrofitting is easy with a proper donor.

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Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
92 300D 2.5 Turbo
92 300TE 4Matic