I had a 68 RS/SS conv. Camaro prior to owning our Bird. It had the cocktail shakers in tact. I then drove a 68 Bird conv that was missing them, I can not say for certain but the car had a very serious vibration at hiway speed. Again, it may have been something else like a bad U-joint but nonetheless the shakers were missing. I have a full set up at my parents house in Buffalo. If I ever speak to them again or go there for some reason I am going to get them and post them on here for someone who needs them...