Yokomo Y2-018AR2PA Aluminum rear shock tower (Purple) for YD-2 series  [Y2-018AR2PA]

That is an aluminum back shock tower utilized in the YD-2 series. There are many upper arm mounting holes so that the upper arm are connected to the outside to fit the brief suspension arm. Basically, when using a short suspension arm, make use of the exterior opening to create the top of supply shorter, and when utilizing a standard suspension system arm, set the top of arm much longer utilizing the internal top supply mounting gap to attain a suitable camber change. It really is now configurable.