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Tony,
I had the same problem trying to refinish my seats this winter. I think the factory used a liquid thread lock to keep the bolts from loosening. To get my stuck bolts out I used a left handed drill bit, 7 mm if I recall. One bolt did come loose. On the other, I drilled to the thickness of the bolt head then chiseled off the head. When using the chisel most of base metal needs to be removed.
Good luck with this.
Harold
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