Plate, Modified 4 x 4 with Clips Horizontal (thick open O clips)
LEGO Set 3729-1 2 x 4 Dark Gray Bricks (2000 Bulk Bricks) | Rebrickable - Build with LEGO
Dark Gray Lego Plates Special 2 x 4 With Pins, P/N 30157 - 4 Pieces - Pre-Owned on eBid United States | 193695981
Lego 50 New Dark Bluish Gray Bricks 2 x 4 Stud Building Blocks Pieces Parts | eBay
Amazon.com: Unirolic Classic Building Bricks, 200 Piece 2x4 Building Blocks STEM Creative Building Toys Compatible with All Major Brands, MOC Building Bricks DIY Play Set for Kids Age 6+ (Light Grey) :
LEGO Set 3459-1 2 x 4 Light Gray Bricks (2003 Bulk Bricks) | Rebrickable - Build with LEGO
LEGO Medium Stone Gray Brick 2 x 4 (3001) | Brick Owl - LEGO Marketplace
Classic Bulk Solid Color Bricks3001 2x4 Building Blocks 150pcs Grey Orange Pieces Compatible with lego All Major Brick Brands| | - AliExpress
Strictly Briks Classic Bricks 96 Piece 2x4 Gray Building Brick Creative Play Set - 100% Compatible with All Major Brick Brands - Walmart.com
Amazon.com: Unirolic Classic Building Bricks, 200 Piece 2x4 Building Blocks STEM Creative Building Toys Compatible with All Major Brands, MOC Building Bricks DIY Play Set for Kids Age 6+(Dark Grey) : Toys