I had the kit fitted to my Chrysler 300 in December. My mechanic took about an hour. No problem. Today I installed a kit on the Mustang. The mechanic had trouble installing the rear pair. I'm not sure what he had to do to set things right, but it took an extra half hour. Overall this seems like a very good product and they really add to the appeal of the car. Expensive but cheap compared to paint saddles.