The mirrors on my truck are apparently an oddball size and won't fit most (any) slip ons because the chrome cover is a little larger? I will investigate the OEM style tow mirrors more. The CIPA slip on mirrors I bought for my F150 were handy to install, but they were smallish and vibrated terribly. In the meantime I ended up with a pair of Fit System universal clip ons that worked very well. The mirrors are large and slightly convex, and did not vibrate at all. They're a little awkward to install, but very doable.