If its going in, tightening for a bit, then popping back out...its stripped. You should even be able to see it on the bolt...like this. Stripped on the left, good on the right.
Reading back through SteveK's solution, Im not sure that I follow 100% but thinking about it more it could be valid. As long as it ties in all components of the tower into one another. You would have to do this from the wheel well I assume? Pics would help.
NoFace you should have received some bolts (2) from Racingline to replace 2 of the stockers. Everything else should have fit back in OK I think. Unless its just a 2010 thing....