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Amazon.com: LEGO Technic Differential gear box kit (gears, pins, axles, connectors) 27 pieces : Toys & Games
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LEGO PART 6538b Technic Axle Connector Ridged [with x Hole x Orientation] | Rebrickable - Build with LEGO
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Axle Pin Connector Lego Technic | Lego Technic Compatible Parts | Lego Детали Technic - Blocks - Aliexpress
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