and it is sized for 1/24 scale models

Powerhobby 1512MG

it installs as a direct replacement and works seamlessly with the stock front end

number ASC81561

HPI Racing 115307 Gear Box Set Jumpshot MT

Losi - LOS-1768 Arms, Hubs: Micro-B Voltage Regulators and it is sized forLosi LOS 1768 Arms, Hubs: Micro B The Losi LOS 1768 is an arms and hubs set made for the Micro B. Suspension arms and hubs control wheel travel and carry the wheels, forming a core part of the suspension assembly. Replace worn arms and hubs with this set to keep your Micro B's suspension performing well. Genuine Losi part, number LOS 1768 Arms & hubs set Compatible with Micro B