I had a missing bushing in one of the rear shocks. So I replaced all four of them. All the bushings were bad. I’ll replace the front after a short trip this weekend. This is a Magnum chassis with 8 airbags. Four rear shocks and four front shocks. I’m pretty sure these shocks were the original Bilstein shocks. I read all the different arguments about Koni and Bilstein. In the end I went with the Bilstein. Why? Because they were $100 per shock cheaper than the Koni. When you need 8, I couldn’t justify $1500+ for shocks. My coach drove and rode well, so it gets the $80 per shock Bilsteins. The Bilstein 24-020930 was the exact replacement and found them on line at Walmart, of all places. The rears were a simple two bolt install with just minor access issues. Impact driver and some long extensions made quick work of it. I’m expecting the fronts to be a little easier because it doesn’t look as tight. If you’re thinking about changing shocks, it was a pretty simple install for my application.