I can't comment on the 50 since I don't own one and didn't really look into it.
I will say that the only time you ever see the self-leveling suspension in a 35 is if it's got the 3rd row seats. Now, what I don't know is if an M Sport 35 w/ the 3rd row gets that suspension or not, my gut tells me yes, but then what happens to the sport suspension? Easiest way to find out would be to decode a VIN w/ the 3rd row.
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