If the problem is with latching, then get a big #4 phillips on the end of your ratchet and adjust the latch. Put some white grease on the spindle and close. Then open and see where the latch is closing. The idea is to adjust it to close centered. But before that, you need to adjust the door in the body opening so that it is equal clearance all around.
open the door and heave up and down on it. Is there vertical play? If so the door pins are worn and need replacing. They are available from MB. Get some brass shim material from the hardware store (comes in different thickness) Make a shim, leaving slots for where it will slip under the bolts. Try different thickness of shims until you get it to fit correctly and evenly all around. The driver door is usually more worn than the others. Look at the back doors to get an idea of how smoothly things should fit and look. This is pretty standard body work stuff., Consult any good body shop text for more details. And happy motoring, these are great cars and will run forever if you keep them greased and aligned and tuned up
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