Dave, Bally has 2 different length posts. The one on the right in your post is the wrong length, hence the loose plastic. The short posts are 1", longer are 1-3/16". I usually swap out the longer ones under plastics to the shorter length to avoid the screw head scratching the plastic. The white nylon acorn nuts are what was OE for Supersonic but the rubber nuts are easier to remove during the enviable switch adjustments under slings and other PF work. The OE nylon nuts are easily stripped out from over tightening so if that's your choice do not over torque them. Also the old nylon nuts will clean up nicely if soaked in bleach for a week, will look nearly new. If you prefer the rubber style, PBR has the best price on them.