Anyone know if the guide pin seals for the rear calipers on a 2001 Suburban 1500 are one-piece or two-piece per guide pin? The ones I got have a metal sleeve that fits inside the pad carrier attached to a rubber seal that slips over the metal flange on the the caliper. This seems right, but I cannot remove the flanged piece that is attached to the pad carrier. From the looks of it, I'm not sure it is supposed to come out. Is there just a rubber seal that fits over the flange on each piece?