LEGO Dark Stone Gray Technic Brick 2 x 2 with Horizontal Rotation Joint (48170 / 48442) | Brick Owl - LEGO Marketplace
LEGO® 48170 4227395 - 6279898 - ToyPro
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Lego Technic Brick Modified 2x2 with Pin Hole, Rotation Joint Socket Parts Lot | eBay
LEGO 48170 4227395 Dark Bluish Gray Technic, Brick Modified 2 x 2 with Pin Hole, Rotation Joint Ball Half (Horizontal Top) | electricBricks : LEGO set and parts shop and database