O.S. replacement exhaust manifold has one exhaust header pipe (cast aluminum). One exhaust adapter (alumminum with red rubber ring). Two cap screws (6x10mm). One cap screw (4x10mm). Three allen wrenches. Header pipe has pre-drilled holes (2) of these holes have cap screws inserted, the third pre-drilled hole contains the (nipple). Header pipe is elbow shaped and easy to bolt on. Exhaust adapter has (3) pre-drilled holes.