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yeah i had this problem, my bolts for the isofix bar didn't have the torx bit in the head either. i could only get the bolt so far out and then just cut the head off it. still got the rest of the bolt stuck in th hole now!
you may as well change the tensioner and the idler whilst you're there.
it's probably the idler that's causing the squeeking as your describing the same symptoms i had.