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I recently had the same problem when changing rear belts of my 1989 930. The bolts are thread-locked with adheasive at the factory in accordance with regulations. I eventually had to drill out one bolt, which wasn't as difficult as it sounds because the bolts are of relatively soft metal. The trick is to drill slowly, and pause often to pervent excess heat setting fire to the surrounding carpet. This was the last resort after trying a 6-sided socket, then a hammer and chisel.
Good luck!
tat
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