The Toyzuki delrin skid is used in V1, V2, V2.5 kits. It can also be used in a V3, if you arent building the V3 with a wraith trans and links. The skid accepts the stock Axial transmission, the ToyZuki...

The V3 skid is designed to be used with the V3 chassis. It is the same width as an scx10, but it's longer to accept the wraith transmission and links. It has mounting holes for the V1 and V2.5 transfercases...