I have used strut cam bolt kits before, but they never came with this special washer. It has an oval opening with two tabs. I can see where it would fit into the oval opening on the strut, but the bolt itself won't fit through it completely, the tabs are too long and they seem to just take up space. Do I need these? I have two for each cam bolt. The bolts also came with two flat washers and one locking washer, which I used.