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.. 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. 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. UMI- Adj Rear Control Arm Roto-Joint. Spherical Roto-Joints installed. Upper Control Arm. Uses OEM hardware

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