If your interior rearview mirror no longer holds adjustment and falls limp you likely need a new pivot "J" bracket. Our 1968-1976 Corvette Interior Rearview Mirror Pivot "J" Bracket is an exact reproduction of your C3's original. This replacement bracket will restore the range of adjustment and ability to hold that adjustment to interior mirror assembly. 1963-1976 Corvette Interior Rearview Mirror Pivot Screw, item # 601-550, is sold separately.