I used these on my Toyotech Ultimate Lift adjustable shocks. You can easily knock out and use these bolts. Some shocks are long enough to simply fit into the holes in these spacers, like mine. I did this because when the Toyotech shocks compress the springs too much for 3 inches of lift. This makes your ride very hard. If you take those spacers and loosen the shocks a bit you get the same lift but a much smoother ride and more travel!