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Either you have the wrong bulbs or you did manage to get them in "backwards" so that the contacts are reversed. The little "legs" sticking out (at least on US bulbs, anyway) are keyed -- one side is lower down on the bulb than the other -- so that you can only get them inserted one way.
I've never had any problem changing an MB bulb unless they were seriously corroded, and your shouldn't have been.
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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