My sister's W126 300SD has a bad driver's side front window regulator. I bought a (cheap) W123 regulator at a junkyard with the hopes that it would fit. Before I dig into it, are they the same?

Thanks,
Tad

no, they won't interchange.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator