I took off both my rods assy. off the rear suspension along with the mounting stud the bolts to the frame. (A while ago and forgot.) My question is, the stud has two nuts and two washers. Both are different. Which goes where? One washer looks to be a standard flat washer, the other one a grooves one side. One of the nuts looks to be a locking type. (Little round depressions on two of the sides.) Any suggestions? Thanks