Ultimate ball joint. Adjustable press-in mounting. For use in lower location on Mustang applications. Includes press-in sleeve. QA1's Ultimate Ball Joint is available in a Press-In Style for a variety of Mustangs. A 100% owner rebuildable design, the Ultimate Ball Joint is a QA1 exclusive. This patented, self-lubricating ball joint is offered with multiple stud lengths, providing for easy geometry changes on your vehicle.