have you ordered these? I have the same part missing.

however - im dubious - the tiny clip should be the same for left and right - its about 10mm x 8mm and almost perfectly rectangular. I also have the epc (have a look on ebay)....

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C140 420 CL
W114 280CE pimpmobile
W114 250/8 Hillclimber with M110 and bike carbs - got any hot cams?