Hotchkis Sport Suspension 1403 1964-1967 GM A-Body Trailing Arm Mount Braces. Hotchkis Sport Suspension Trailing Arm Mount braces are designed to reinforce the upper cross member of your 64-67 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.