Spacer Kit: Part #1058 spacer kit designed to fix the oversized hole problem with the factory rear upper control arm mount. Where the rear upper control arm mounts to the chassis Ford uses a 14mm bolt and a 14mm hole in the upper control arm, however the hole in the chassis mount is 16mm. This stepped spacer set is designed to take up this slop and eliminate noise and clunks from the upper control arm area. This is done by reducing the hole size from 16mm to 14mm which does not allow the bolt to shift during acceleration and braking. The spacer kit slides into the upper mount and steps the hole size down to the correct diameter of 14mm, this allows for a tighter fit and no more clunking! Note: This kit is designed to work with the OEM upper control arm mount. It will work only on aftermarket control arm mounts that use a 16mm hole. Most aftermarket companies supply there new upper mounts with 14mm holes.. This upper control arm is a direct bolt-on replacement and features a spherical Roto-Joint. The Roto-Joint design is a pivot ball lined with a greaseable delrin race designed to offer 28 degrees of total unrestricted movement, more than adequate for a bind free, low friction operation. The Roto-Joint design improves performance over the factory rubber and aftermarket polyurethane bushings by allowing the suspension to articulate correctly, and provides precision handling. The installed UMI Roto-Joint allows rear end free movement when high handling, auto cross or road race is a concern while still being a 100% streetable setup. The installed delrin race, which lines the spherical ball, absorbs shock and road noise for a quiet and smooth operation on any street or track driven vehicle.. This rear upper control arm replaces the factory stamped control arm reducing wheel hop and increasing traction. The S197 Mustang chassis uses a 3-link rear suspension system with a panhard bar to control the rear end under the vehicle. Under hard loads the factory pieces tend to flex and rubber bushings deflect leading to poor traction and erratic handling. Replacing the factory pieces with stronger well designed items eliminates this flex allowing for better control of the vehicle and improved traction during launches.. Upgrade to a rear upper control arm with a spherical Roto-Joint for improved traction and handling. This direct bolt-on replacement features on-car adjustability and is constructed with 1.250” x 0.120” DOM mild steel tubing. Includes a spacer kit for fixing oversized holes in the factory mount.. Bolt-on rear upper control arm upgrade with Roto-Joint for better traction, handling, and on-car adjustability. Built from DOM steel tubing with a spacer kit to fix oversized factory mount holes.. UMI Performance 05-10 Ford Mustang Adjustable Upper Control Arm- Roto-Joint. Roto-Joint control arm upgrade with steel tubing & spacer kit.. On-car adjustable using a chrome moly, heat-treated adjuster. Mounting plate CNC machined from 0.250” thick mild steel. On car adjustable using a chromoly, heat treated adjuster. Shipped fully assembled and ready to install. Brilliant and durable powder coat finish. 4140 chrome moly threaded tube adaptors. Fully TIG welded for superior strength. 4140 chromoly threaded tube adaptors. UMI- Adj Rear Control Arm Roto-Joint. Spherical Roto-Joints installed. Upper Control Arm. Uses OEM hardware. Features:

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