This is a bearing kit by Avid RC for the Xray XB2C ('18, '17), XT2 '18, and XT2. The XB2C '18 and '17 have a gear diff and a laydown 3 gear transmission where the Dirt Edition has a ball differential and stand-up 3 gear transmission (4 gear stand-up case is optional).
XB2C '17
XT2
XB2C '18
XT2 '18