As a last resort you can get or borrow a hand grinder and grind the heads off the bolts. Please use a face shield and make sure you are NOT in the "line of fire" should the abrasive wheel come apart -- we had this happen at work this week, and the contractor said it is a fairly common event. Usually doesn't result in injury, but be prepared.

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!