Lego 1x 4216 White Brick, Modified 1 x 2 with Groove | eBay
LEGO® 4216 6347986 - ToyPro
Amazon.com: Classic Building Bulk Brick 1x2 with Groove, 200 Piece Light Gray Building Black 1x2 with Groove, Compatible with Lego Parts and Pieces 4216(Colour: Light Gray) : Tools & Home Improvement
Brick, Modified 1 x 2 with Groove : Part 4216 | BrickLink
Amazon.com: Classic Building Bulk Brick 1x2 with Groove, 300 Piece Red Building Black 1x2 with Groove, Compatible with Lego Parts and Pieces 4216(Colour: Red) : Tools & Home Improvement