N Scale Single Track Concrete Tunnel Portal -- 2-13/32 x 2-1/2" 6 x 6.25cm pkg(2)

N Scale Double Track Cut Stone Tunnel Portal -- 3-1/2 x 3-29/32" 8.7 x 9.7cm pkg(2)

N Scale Single-Track Random Stone Tunnel Portal 2-Pack -- 2-3/4 x 2-1/2" 7 x 6.4cm

N Scale Double Track Random Stone Tunnel Portal -- 3.5 x 2.75" pkg(2)