You should have an adapter on the lower shock mount. It coverts it to loop style. Just unbolt it and use the hole Otis in ,which is the actual original pin style shock mount, to mount the shock.
You might have a problem thigh because the rock ware hoops are made for extended shocks and the bilsteins that you are replacing them with don't spear to be. You can order some stock mounts and sell the rock wares or get longer shocks.