Hotchkis 64-72 Chevelle / El Camino / GTO / Skylark / Cutlass Lower Trailing ArmsHotchkis Sport Suspension 1302 1964 1972 GM A Body Lower Trailing Arms. Hotchkis Sport Suspension lower trailing arms for your 64 72 GM A Body improve traction reduce wheel hop and improve handling and stability. Designed as direct replacements for weak stock trailing arms Hotchkis fabricated trailing arms are constructed from one piece of . 120 in. wall TIG welded steel tubing making them the strongest in the industry and include greasable