I ordered this Rear Disc brake kit for my 2003 Silverado 1500. Parts arrived yesterday, with box beat up big time. I opened it today and discovered that the calipers are marked for FRONT brakes! I've tried to find a way to verify if they also work on my REAR brakes, or did they erroneously send the wrong caliper and brakes. I can find no way to ask this question! I can either return partial or whole order, which would be dumb if someone could just verify parts correctness.