BrickLink - Part 3022 : LEGO Plate 2 x 2 [Plate] - BrickLink Reference Catalog
BrickLink - Part 4032 : LEGO Plate, Round 2 x 2 with Axle Hole [Plate, Round] - BrickLink Reference Catalog
brick-store.de - LEGO® 2x2 Platte / rot
LEGO® Plate 2x2 with Knobs BRIGHT BLUE (BR. BLUE) - (4613973/302223/3022)
LEGO® 317626 3176 - ToyPro
Brick-Shop - Technic socket 2x2 light-gray (63082) 4530469 hinge connector plate 1x2 (44302) Electric Battery Box Train Power Functions Motor (8881) Engine Motor Lego (7897)