my SD's mb tex interior isnt in that bad of shape for being 25 years old. however i have found a complete very nice interior from 1990 420sel with 69k miles. its complete with front and rear seats, seat controls, rear head rests

and its leather

.
my question to the experts is will that set drop right in if i remove my current interior? also the guy mentions something about having to modify the front tracks slightly? any ideas?