W123 and W126 sub frames are configured differently... The W126, of course is bigger and heavier. I've helped change out he rear sub frames which were badly corroded. Of course, southern cars have a better chance of surviving longer due to the lack of salt that they encounter. Northern cars should be reviewed periodically to ensure they are not "falling apart".

__________________
Pete Williams, President emeritus - MBCA-International Stars (Eastern Mich.) Now Wi. & Az.
1985 300D Manual 4 speed Green Hen's tooth
1979 MGB triple black Az car nice
1969 back 1/2 of MGB (Az home built trailer)
1991 Volvo 245 Wagon Nice AZ Restored Gold Brick
1983 Jeep CJ7 37,600 Miles Summer use only