GOBRICKS GDS-943 Axle Connector 2 x 3 Quadruple – Your World of Building Blocks
Brick-Shop - LEGO Technic 4210751 dark gray liftarm brick 1x3 white (32523) Electric Battery Box Train Power Functions Motor (8881) Engine Motor Lego (7897)
BrickLink - Part 32523 : LEGO Technic, Liftarm Thick 1 x 3 [Technic, Liftarm] - BrickLink Reference Catalog