Anone know who makes a clamp with a rubber insert that will fit the 1 5/8" Rad-a-Cage tower? I have an Aerial speaker and light bar combo, but the smallest the clamp will go is 1 3/4". I need the rubber inserts since the tower has an upward curve to it and is not parallel to the speaker/light bar. Anything rigid would have a gap on the lower inside and the upper outside. Any thoughts or pics would be great. Thanks.