Image Item No. Description By  6005  Arch 1 x 3 x 2 Curved Top Catalog: Parts: Arch 2  18653  Arch 1 x 3 x 2 Inverted Catalog: Parts: Arch 1  13965  Arch 1 x 3 x 3 Catalog: Parts: Arch 1  76768  Arch 1 x 5 x 4 - Irregular Bow, Reinforced Underside Catalog: Parts: Arch 1  30099  Arch 1 x 5 x 4 Inverted Catalog: Parts: Arch 1  6060  Arch 1 x 6 x 3 1/3 Curved Top Catalog: Parts: Arch 1  30528  Arch 1 x 8 x 6 (Portal) Catalog: Parts: Arch 1