Hotchkis Sport Suspension 1215 1967-1970 Chevrolet B-Body Adjustable Upper Trailing Arm. Improve handling and traction on your 67-70 Chevrolet B-Body by upgrading your flimsy stock trailing arms with our double adjustable upper trailing arms. Machined from 1.75 in. 6061 T6 Aluminum these adjustable arms feature greasable polyurethane bushings grade 8 hardware and a durable powder coated finish. Note: These arms are sold each. Please verify if your vehicle requires 1 or 2 upper arms. Specs: Stock arm length from center to center is 12-13/16 in. The maximum suggested length of the hotchkis arm from center to center is 13-13/16 in. The minimum suggested length of the hotchkis arm from center to center is 11-13/16 in.