These upper third link mounting brackets feature the same bolt pattern as a quick change rear end. They allow you to use the brackets that are commonly used on a quick change. They are ideal for running a 9" Ford rear end in chassis with brackets set-up for quick changes. They are designed to be mounted on the pinion center line of the 9" Ford housings. Note the 9" Ford housings vary in sizes and contours the brackets may need to be fitted to some housings.