Mac's and other aftermarket suppliers sell the rubber attached to the metal surround, NEW about $60. You then reuse the center retainer from the rear and the steel ring on the front. These two pieces are not attached to the rubber when new. You also reuse the 4 special head U-joint cover mounting bolts. At one time you could have new rubber molded to your old metal surround. I believe Vern Tardel offered this service about $100.