Anyone bought and installed the grocery hooks that are supposed to mount in the trunk? They come with riv-nuts for the install but no pre existing holes appear to be available. The limited info I can find showed them appearing to be mounted by removing the push pins that hold the liner near the back seat release cables. Does not seem reusing the push in pins would hold it securely. If you remove the clip the push pin goes into, it is then a square hole that is to large for the riv-nut. Any help would be greatly appreciated.