I used these for the door windows. The rollers on my driver side door window was shot. I installed them two different ways, one way was doing a cross section with a hammer and chisel without the washer, I did the other with washer and a tool that was beveled and as I hammered the beveled tool into the back side of the roller pin, it spread out and then i just hammered it flat. I think i like the second way with the washer better. It would be nice to sell the rollers separate for the doors from the rear windows. I have left over parts that don't go on the front door windows. A bit pricey. See pictures for example. Both are very secure.