Plate, Modified 1 x 2 with 2 U Clips (Horizontal Grip) : Part 60470 | BrickLink
Lego 1x2 Plate with 2 Side Clips Qty 6 (60470) - Pick Your Color | eBay
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Plate, Modified 1 x 2 with 2 Open O Clips (Horizontal Grip) : Part 60470b | BrickLink