From My understanding, these are Not Jacking Tabs. they are easily damaged when trying to jack on them. From what I have heard, these were Factory Alignment Tabs. In the days when Mustang was born, Mechanics used thin rods inserted through these Tabs to Get a Proper suspension Alignment. Nowadays they use LASER's which can be used with these Tabs. that is also why New-Aftermarket Control Arms Just come with the Tiny Bumps, as the laser can read the minute change in the formation of the control arm and actually give a more precise alignment than the Tabs. I am not a Suspension Engineer, just thoughts. I am always Open to discussion. .