Novak conversion motor plates are each unique motor plate that is predrilled and designed-to-fit in your specific 1/8-scale vehicle for easy installation and is intended to use with the 550-size motor heat sink (#5051). The motor plates are made of anodized aluminum and include all of the necessary hardware to install. The 1/8-Scale Conversion Motor Plate for Mugen MBX5 weighs 24.2g (0.85 oz).