Xtreme Racing recently announced a new pair of dirt oval specialized shock towers for the Traxxas Slash 2wd. The new towers are machined out of 4mm thick carbon fiber for increased rigidity and have multiple mounting positions for both the shocks and camber links. The upper shock mount holes allow the shock to be stood up for a more linear feel as opposed to the laid-over progressive setup of the stock towers. The new shock towers are sold individually and include all hardware necessary for installation.
Link to rear shock tower: http://www.xtremercracing.com/Products/TRAXXAS_SLASH_CARBON_FIBER_DIRT_OVAL_REAR_SHOCK_TOWER_4mm/10642