Alright, so I've got the 73 disc brake spindles on my car. I've got the drivers side caliper and pads mounted and good to go. Passenger side caliper piston won't compress enough to fit over pads and rotors. What gives? I can't see any evidence of corrosion that would have the piston seized. Do you think O'REILLYs will exchange it without giving me a hard time?