It isn't particularly clear to me (cos I don't own the model) where that bolt goes and on which part of the car it is. Is this front suspension or rear? (It might not matter of course!)
I'm not sure if the following advice is appropriate but in similar situations I've removed the head of bolts by grinding away carefully so that the tension in the bolt is gone - allowing the remaining shank to be turned (with easy outs in some cases).
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