Looks good, however, Ford did not service the lower ball joint or boot separately for Mustangs, the entire lower arm was replaced. However, there is a boot shown as a lower ball joint replacement for 65 to 69 Mustangs, C7OZ-3A105-B, but I think it requires the ball joint to be removed to fit the boot. Check with Fred Ballard, flyingfred on this forum, to see if it's a good replacement and if he has any.
Jim