I'm replacing the front brake pads and rotors on my 06 G6 base 2.4 litre. When I go to mount the caliper mounting bracket with the new rotor I can't get the bracket holes to line up with the bolts on the frame. Everything else is fine. the new brake pads fit on fine, the caliper fits right over the rotor. I confirmed I have the correct rotors. Any suggestions? Is it normal for new rotors to create such a tough fit for the mounting bracket?