TA Performance replacement rocker arms are direct replacements for stock rocker arms. Sold as a kit that includes polished chromed shafts, steel rockers, and new nylon buttons. TA replacement rockers are recommended for any mild street application or Buick rebuild to replace worn rockers. Our Heavy Duty shafts incorporate 30% thicker walled shafts with 17% more material around the bolt locations for a considerably stronger piece.