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The OEM subframe mounting holes of Mustang S550 are large in comparison to the subframe mounting bolts. Since the size of the bolt and the hole is different, the subframe might be misaligned to the left or right up to a 1/2" from the factory. The HARDRACE rear alignment kit is made from CNC-machined. They will slide into the subframe mounting holes to fill the space between the subframe mounts and the bolts that attach to the rear subframe.

. Perfect Alignment of the Rear Subframe to Chassis
. No increase in NVH
. Easy to install
. No permanent modifications