Amazon.com: LEGO Technic COMPLETE GEARBOX ASSEMBLY 2 x 4 x 3 1/3 Trans-Clear Wormbox gear motor REDUCER block Mindstorms robotics ev3 NXT transparent robot building power functions part 6588
LEGO Blue Panel 1 x 4 x 3 without Side Supports, Solid Studs (4215) | Brick Owl - LEGO Marketplace
Lego Parts: Bar 1 x 4 x 3 (62113/4521681) – Wholesale~BricksandFigs
LEGO Transparent Orange Rock Top and Bottom 4 x 4 x 3 | Brick Owl - LEGO Marketplace