Because there is a large difference between the first and second generation W126 radiator support, crossmember, etc. I found this out when I went to install first generation Euro sedan wiper motors on a second generation sedan body--they didn't fit--too shallow by about an inch and offset by about an inch.

I'm honestly surprised anyone else here knew this because I had been asking on this and other forums why the wiper motors didn't fit and no one knew or could confirm any differences in the body between first and second generation.

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles