They all should bolt up. A W126 is a W126. I can't think of a reason why it wouldn't be a direct swap.

After you do it please post 0-60 times and MPG figures. It would be very interesting to see the results.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200