When I had one on my car, it was adjustable and I wrapped tape around the small end and then assembled it and installed. No rattles.Ihave one on both my 67 & 68, just for to have it their. All the do is rattle, when you go over mild bumps, and seems in the road, kind of a rattle/klinking sound.
...........how critical/useful to have one on in this car? cruiser/no serious racing car..