The MB harnesses seem to be cracking and getting brittle on
all models, not just the 124. I have fixed 126's, 124's, and 201's.
However lately I have been seeing lots of 140's like S500/600's.
129's of all kinds, 210's E-class diesel thru E55, and lots and
lots of 202 C-classes. The hotter the climate and the hotter
the engine, the worse it seems to be.
Handle those harnesses with care. 2000's are starting to pop up.