Amazon.com: Hobbypark Steel Metal Mod 0.6 Module Pinion Gear Set 3.175mm Motor Gears 17T 21T 26T 29T 11189 11176 11181 11119 for RC Car Redcat HSP Exceed (4-Pack) : Toys & Games
Amazon.com: Redcat Racing BS213-026 Spur Gear 55T (.8 Module) : Toys & Games
Spur Gear Made of Acetal Resin die-cast with hub Module 0.5 17 Teeth Tooth Width 3mm Outside Diameter 9.5mm: Amazon.com: Industrial & Scientific