Pulling out my old KYB rear shocks . Was a total pain...Took an hour to get the bottom of shock off mounting pin. Finally get it off..Pull out new Bilstein and it has a metal bushing. I can't tell if the old bushing from the kYB is on the mounting pin or if the new Bilstein has to have the bushing removed. Did anyone install Bilstein 4600's and they went on with the metal bushing or did it have to be removed? It won't fit on the mounting pin with it unless I remove what appears to be an aluminum sleeve over the mounting pin. Thanks!