Well, not completely bolt-on. Not for us, at least. The control arm frame bracket connects at a point where the front boxing on the frame stops and the rest is C-section. This made for a nasty 1/8-inch lip that would necessitate using washers to even out the spacing, but instead, we used 1/8-inch steel plate to make a flat mounting point for the bracket. We drilled the holes and bolted on the brackets using 1/2-inch hardware.