I bought 1.5 wheel spacers for my 2012 F 350 from protuning when they are installed on the truck there is a severe vibration @45 to 50 mph and again @ 60 and over. I removed them and the vibration went away. after 2 attempts to contact them the response is that they need a video of the vibration. not sure how to do that. they also said that if they were mounted on the truck that they wont accept a return. I don't know how I would know there is a problem if I can't mount them on the truck. I went to a lot of work to mount these wheel spacers because they are 1.5 and the studs on the truck 1.75 so I had to cut .25 off of every stud and now I cant use them