Shock absorbers arrived 2 days early. I picked them up from a UPS pickup point in my driveway, drove home, and twenty-five minutes later they were installed. It took me five minutes to find my 15mm and 18mm heads! I can't say they are any better than the OEM Rancho shocks that came with the truck (2016 F250 4WD) but I can say they got my truck in near new driving condition and maybe even better are better. I have previously fitted the same 5100 series Bilstein front shocks with a 5100 series steering stabilizer. Rides great on and off road.