Its time for some new ball joints and tie rods on my Bonneville. The tie rods are taken care of, so no trouble there. For the ball joints, I went with new control arms with the ball joint, bushings, etc. My question is what size is the nut on the control arm? I don't seem to have anything big enough to take the old control arms off.

On my 2000 Buick Park Avenue Ultra the control arm bushing bolts and nuts are 18mm. (I just changed them today.)