If you're installing them, do yourself a favor and swap out the shock absorbers right away. I had 70,000 leaks. These are certainly not inserts, the entire front section should fall apart badly. I had to pull on the axles to get the shocks in and out. All done with the new Bilstiens and now they look and drive well. At the very least, if you're not an experienced backyard mechanic, do it at a shop!