Hoping you can help me out. Had hip surgery late in January and I am having difficulty determining the correct size of the 4 nuts that hold the sway bar on. It is still a challenge for me to get up and down from under the car to the tool box and I believe I have tried the following without success - 15mm to small, 16mm can't remember if to big or to small, 17mm to big, 9/16 to small and 5/8 to big. Can you help, what size should the acorn nuts be?