I bought these Fel-Pro bushings, it is necessary to replace the rocker cover gaskets on any car that requires these gaskets when if you use it on old bushes MAYBE AND VERY GOOD IT WAS A LEAK IN THE VALVE COVER AND IT ALL WORKS IT WAS NOTHING. I JUST REPLACED THE VALVE COVER GASKETS ON MY VEHICLE AND THIS VEHICLE REQUIRES THIS GASKET KIT (SIX) 6 ON BOTH VALVE COVER AND (1) ONE FOR REPLACEMENT COVER. FOR INSTALLATION SIMPLY REMOVE THE OLD BUSHING AND REPLACE IT WITH A NEW ONE AND SIMPLY REPLACE THE VALVE CAP AND INSERT THE SCREW AND BUSHING THAT SLIDE ON THE SCREW AND SCREW INTO THE BOLT HOLE AND AFTER ALL THE SCREWS AND BUSHINGS IN INTO BOLT HOLE, TIGHTEN ALL BOLTS WITH WEIGHT AND FOLLOW THINGS FROM RIGHT TO LEFT AND CONTINUE TIGHTENING UNTIL ALL BOLTS AND BUSHINGS ARE TIGHTENED. FEL-PRO BUSHINGS ARE BLUE, VERY EASY TO USE AND A GOOD PURCHASE FOR VALVE BODY GASKET OVERHAUL. NEW IS WORTH IT. FEL-PRO IS A GREAT PRODUCT WORTH THE COST FOR A JOB WELL DONE.