LEGO Gearbox for Worm Gear (6588 / 28698) clear color | eBay
LEGO 6588 Technic, Getriebe 2 x 4 x 3 1/3 - KOSTENLOSER VERSAND! | eBay
LEGO 6588 4142824 Trans-Clear Technic, Gearbox 2 x 4 x 3 1/3 | electricBricks : LEGO set and parts shop and database
Technic, Gearbox 2 x 4 x 3 1/3 : Part 6588 | BrickLink
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 part 6588 - Black Technic, Gearbox 2 x 4 x 3 1/3 at BrickScout