The Installation Kit includes: Attic stairs installation instructions, Stairway trim kit installation instructions, Temporary support boards, Two pieces of trim/molding: 2-1/4 in. x 52-3/4 in. (inside corner dimension), Two pieces of trim/molding: 2 1/4 in. x 24-1/2 in. (inside corner dimension), Fourteen 1/4 in. plywood shims, 3 in. wood...