Image Item No. Description By  20310  Brick, Modified 1 x 1 with Scroll with Hollow Stud Catalog: Parts: Brick, Modified 5  15411  Brick, Modified 1 x 1 with Stud on Side and Conductive Element on Opposite Side (AppBrick) Catalog: Parts: Brick, Modified 4  44865  Brick, Modified 1 x 2 with Pin and Bottom Stud Holder Catalog: Parts: Brick, Modified 11  18892  Brick, Modified 2 x 4 with Wheels Holder with 2 x 2 Cutout and Hole Catalog: Parts: Brick, Modified 3