Had the same issue when I did mine. The factory paint had basically glued the bolts in place.There was just enough of a thin film of paint around the head of the bolt that it wouldn't move. I put the torx socket in the head of the bolt and gave it a good wack with a hammer to break the paint that was just around the edge of the bolt head and they spun right out. You don't have to hit it hard. Just hard enough to fracture the paint around the head of the bolt. Yours may not be the same issue but, it's worth a try.