Hotchkis Sport Suspension for 1968-1972 GM® A-Body Trailing Arm Mount Braces. Hotchkis Sport Suspension Trailing Arm Mount braces are designed to reinforce the upper cross member of your 1968-1972 GM® A-Body vehicle for added strength and performance. High horsepower cars can bend or break the upper frame cross member. Protect your vehicle and your performance with this simple bolt in application. Braces include grade 8 hardware and feature TIG-welded construction durable black powder coat and a adjustable design. This item is a must for any high horsepower Chevelle®, GTO®, El Camino®, or other A-Body models.