This is the optional M2C Racing Kyosho Inferno MP9 TKI3 Split Center Differential Mount. This split center diff mount is machined from 6061 aluminum and clear anodized, and will allow you to remove the center differential from the chassis without messing around with the hardware on the underside of the chassis. In fact, M2C says this mount will allow you to remove the center diff in less than 1 minute!
The design provides a light press fit on the center diff bearings and will lock the bearings securely in place. The top half of the mount bolts to the top plate and can be removed by removing the four 3mm screws that hold the assembly together and then taking off the throttle servo horn and lifting the top cap off. Package includes all parts and hardware required for installation.