INTAKE SEALS, MANIFOLD. S&S HEADS | SEAL 1.880" I.D. VITON; THINNER THAN STOCK; USED WITH ALL S&S MANIFOLDS, WHICH HAVE A SLIGHTLY LARGER DIAMETER THAN STOCK MANIFOLDS for 84-17 B.T. (excl. 2017 M8); 86-17 XL; 08-12(NU)XR1200. With S&S manifold | set of 4 pieces