In addition to the conversion of older model M48s, Chrysler continued to build new vehicles. New vehicles built to this standard used the M48A2 hull design (with 3 return rollers) and had redesigned fenders and mudguards, armored boxes around the taillights among other minor details. They were fitted with another re-designed commander's cupola, the M1E1. It had a modified hatch to allow more room in comparison to the previous M1 cupola and the two rear vision blocks were eliminated. The driver's steering wheel was replaced with a T-bar control and received a padded seat. M48 procurement for the Army ceased and M48A2 hull production ended in May 1961. The Newark Tank plant was closed in October. This newest version of the M48 series received the designation Tank, Combat, Full-Tracked; 90mm Gun, M48A3 on 19 March 1958.