Amazon.com: LEGO Arctic 6578 Polar Explorer : Toys & Games
LEGO 6578 Polar Explorer Set Parts Inventory and Instructions - LEGO Reference Guide
LEGO Part 2994c01 Wheel 30.4 x 14 VR, with Black Tire 30.4 x 14 VR Balloon - 2994 / 6578 (Light Bluish Gray) | iBricktoys: LEGO shop guide and database
LEGO 6578 Polar Explorer Set Parts Inventory and Instructions - LEGO Reference Guide