When we called Virginia Classic Mustang to order the manual steering center link (also known as a drop link), we were told we also needed a manual steering idler arm. Two long, high-carbon Grade 8 bolts retain the idler arm. Bolt the heads outside and lock nuts inside. If you want exceptional performance, opt for an original equipment-style idler arm, not an aftermarket replacement. Factory idler arms snap back to center, which aids return to center performance. Aftermarket idler arms do not.