Rebuildable style, not button top. Original Carter X stamped 3734S. Has filter, but will need the reproduction white and red canister available from your favorite Mustang supply house. Has small block arm, dated L3 or November 1963. Too early for a Mustang but for other 1964 Ford with 260 or 289 engines. Will fit in flat rate priority mail box. Free shipping to lower 48.