The product description includes a complete kit with UMI Performance adjustable lower control arms and fixed length non-adjustable upper control arms. These direct bolt-on replacements are designed to minimize wheel hop, improve cornering, lower ET's, and enhance track consistency. The lower control arms are constructed from DOM mild steel tubing with a 4130 chrome-moly threaded tube adaptor, CNC machined, and TIG welded for exceptional strength. The spherical rod end allows for bind-free operation, while polyurethane bushings provide a quiet and comfortable ride. The upper control arms feature mild steel mounting points, DOM steel tubing, and polyurethane bushings. Both control arms include polyurethane bushings, zinc-plated steel sleeves, and greaseable zerk grease fittings for easy maintenance. Adjustments can be made using high-quality QA1 Teflon lined spherical rod ends for quiet performance. Additionally, the lower control arms feature reinforced spring perches and heavy-duty sway bar mounting points. Installation is easy with bolt-on installation that does not require drilling and uses OEM hardware.. Complete UMI kit with adjustable lower and fixed upper control arms. DOM steel, TIG welded, chrome-moly adapters, and Teflon-lined rod ends for strength and smooth performance. Poly bushings, easy bolt-on install, no drilling required.. UMI adjustable lower & fixed upper control arm kit—strong, quiet, bolt-on. UMI Performance 99-04 Ford Mustang Upper & Lower Rear Control Arms Kit. Reinforced spring perches and heavy duty sway bar mounting points. Lower control arms constructed with DOM mild steel tubing. Set of fixed length non-adjustable upper control arms. Upper control arms feature mild steel mounting points. Set of UMI Performance adjustable lower control arms. CNC machined and fully TIG welded for strength. High quality Teflon lined spherical rod end. Easy bolt-on installation in about 1 hour. Polyurethane bushings for quiet operation. Spherical rod end for bind-free operation. 4130 chrome-moly threaded tube adaptor. Lower ET's and help track consistency. High Quality polyurethane bushings. Direct bolt-on replacements. UMI- Rear Control Arm Kit. Zinc plated steel sleeves. Rear Control Arm Kit. Minimize wheel hop. Improve cornering. Uses OEM hardware

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov