Hotchkis Sport Suspension 1216 2011-2012 Mustang Adjustable Upper Trailing Arm. Hotchkis Sport Suspension Adjustable Upper Trailing Arm for the 2011-12 Mustang are designed to be stronger than the factory units improving traction and reducing wheel hop. The adjustable design makes pinion angle changes a breeze while the high articulation 7/8 in. PTE lined heim joints allow for adequate suspension twist for maximum articulation and minimal suspension bind up. Massive 1.5 in. CNC machined turn buckles are mated to the TIG welded tail section which is finished in gloss black powder coat for durability. The adjustable trailing arm bolts directly into the car using existing mounting points and can be done in minutes. Hotchkis Adjustable trailing arms are a must have finishing touch for any high performance 2011-2012 Mustang.