Could anybody enlighten me about the differences in the rear shock absorbers fitted to the 129? Some models are fitted with part number A1293200031 while others have part number A1293200131. There is no obvious rhyme or reason (eg models or years). They look the same. What is the difference, if any? Thanks in advance.

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JJ Rodger
2013 G350 Bluetec
1999 SL 500
1993 E300 diesel T
1990 190