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Hot Racing Arrma Grom Aluminum Motor Mount Set. This is a replacement motor mount set intended as an upgrade for the Arrma Granite and Typhon Grom 1/18 4WD Monster Truck and Buggy platforms. Made from high-quality aluminum, these motor mounts will add strength and durability compared to the standard mount. The aluminum construction helps heat dissipation and provides a more rigid design, offering improved power transfer while reducing the risk of overheating. This set is compatible with 16T to 27T pinion gears when using the standard fifty-nine-tooth spur gear.