The Racecraft Inc. lightweight 2 1/2" OEM style manual Mustang rack bumpsteer kit was designed for use with our 79-93 Mustang 2 Drop Spindles (P/N 300102) and 12" lower A-arms. Instead of the standard 5/8 bolt kit uses a much lighter 7/16 bolt also eliminating the usual 3-4 bumpsteer stack. This is due to the revised steering arm location of our spindles. This kit is used for the OEM rack and pinion (9/16-18 UNF) and 1" shorter lower control arms.