All of the UPR bits installed on Lethal’s project ’Stang are double-adjustable. However, don’t get too crazy with adjustments at the outset. Stock length is always a safe starting point for any aftermarket control arm. Here Jeremy measures the stock control arm, then adjusts the UPR Pro Series heavy-duty adjustable lower control arms to the same length. After measuring them, Jeremy slides them over the stock fasteners in the stock arm to ensure a smooth fitment.