 It was planned that armor packages for the production vehicles would be customized for each customer.Available options included additional STANAG Level 6 armor plating for the hull frontal arc to the third road wheel, slat/cage armor skirting for the turret, steel or composite armored side skirts, spall liners and reactive armor packages.The M60A1 chassis was modified with the enhanced torsion bar system of the M1 series MBT to take account of the additional weight of the M1A1 turret as well as the additional armor that would have been fitted to production vehicles.