Use this kit as the frame mounts for stock-style Mustang II strut rods.
The strut rod washer is used to tighten bushings that are loose on the 3/8″ bracket. The gussets are 3/16″, main plates are 3/8". The center of the 1-1/2″ diameter hole is 2-3/4″ from the opposite side. That edge is 2-13/16″ long.