In 84 and 85 ABS and the drivers side airbags were options in W126's you see them once in awhile in 300SD's. But the SD's were the cheap cars, you see them more often in gray market 500SEL's. When the W126 got its big face lift for the 1986 model year they were made standard.

A 617 is a 617 doesn't matter what car its in, the block heater is the same as your car. Similer to the 603/6 as well.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200