BrickLink - Part 12591c01 : LEGO Duplo Car Base 2 x 4 with Fixed Axles, Black Tires and Flat Silver Wheels [DUPLO, Vehicle] - BrickLink Reference Catalog
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2012 LEGO Duplo 15314 12591 Chassis Base Gray | eBay
Lego Duplo Black Car Base 2 x 4 Fixed Axles Black Tires Yellow Wheel Hubs 12591 | eBay