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Tile, Modified 1 x 1 with Clip : Part 2555 | BrickLink
Brick 1x1 Light Bluish Gray - The Brick Chick
1x1 Modified Brick with Stud on 1 Side, Indented - Light Gray
LEGO Dark Stone Grey Brick Modified 1x1 Studs 4 Sides 4210700 4733 (single,N)
50 NEW LEGO Medium Stone Grey Angle Plate 1X1, W/ 1.5 1X1, Downwards (6248078) | eBay
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LEGO 1x1 Plates Dark Grey 50 Pieces Dark Bluish Grey Plate - Etsy
Amazon.com: Pixel Bricks Mosaic Art Pieces Compatible with Lego, 1x1 Plate 100 Pieces 3024 Brick, 40+ Colors Available (199-Dark Stone Grey) : Toys & Games