Thanks Junkman for the info. For anyone interested the pn is 126 267 0197 $10 from MB dealers. For all of the people that told me on the phone that there is no such part - including the dealer parts guy who said he knew because he has 2 126s - ALL 126s HAVE THEM or at least were mfg with one.

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85 300 SD ~ 115K
82 500 SEC Euro ??K
78 450SL 164K