I'm working on the front disk brakes and went to the local parts store to get the ruber rings for inside the calipers. The ones that were supplied did not have the thin metal band in them. The larger one came with a round wire that seems to slip over the ruber after it is installed like some type of retaining ring. The other is just a ruber ring that fits in the chanel. Has any one else had this type of set-up, and am I right in thinking the metal ring goes over the outside of the larger one?