LEGO part 3649 - White Technic, Gear 40 Tooth at BrickScout
LEGO Sets with Part 3649 Technic Gear 40 Tooth
Amazon.com: LEGO Technic Large Gear 40 Tooth Mindstorms NXT Light Grey Part 3649 Piece (Quantity 10 pcs) : Toys & Games
Self-locking Bricks Free Creation Of Toy Moc Technical Gears Parts 6pcs Gear Wheel Z40 Building Blocks Compatible With Lego 3649 - Model Building Kits - AliExpress
Metal 40T Tooth Gear compatible with Lego Technic like 3649 / 34432 – Metal Technic Parts