It sounds like you might be making the same mistake I did when I got my cargo net. There is a bolt on each side of the trunk with a plastic cap sticking through the carpet, pointing in towards the center of the trunk. Those aren't the ones you want, as you discovered those bolts are too small for the anchor. The bolts you want are buried under the carpet, they're attached to the back of the tail lights and point towards the front of the car. You have to cut the carpet to get them to stick through so you can attach the anchors for the net.