BrickLink - Part 553b : LEGO Brick, Round 2 x 2 Dome Top - Blocked Open Stud with Bottom Axle Holder x Shape + Orientation [Brick, Round] - BrickLink Reference Catalog
LEGO 553c 4216652 White Brick, Round 2 x 2 Dome Top - Hollow Stud with Bottom Axle Holder x Shape + Orientation | electricBricks : LEGO set and parts shop and database
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