Rear sway bar install

One question, "HOW" do you access the bolts that hold the sway bar link brackets to the frame rails?
Rusty: In photo one you see two plated u-bolts that are squared off. After loose bolting and centering the sway bar one loose bolts the links to the bar and swings it up to mark the holes for drilling. I marked one location on each side and pilot drilled a hole that was final at 3/8" per instructions. With one hole located I inserted one leg of the bracket bolt and market the other hole and drilled it up. Then per instructions one fishes the bracket bolt up into the frame and across to the other hole pulling both legs down through the drilled holes. I was skeptical but it worked as planned and of course there is no backup wrench required as they are essentially u-bolts. I hope my answer makes sense.