D ; this variant , of which 248 vehicles were produced , reintroduced the hull machine gun .
D ; this variant , of which 248 vehicles were produced , changed the turret 's internal gun mantlet to a 35 mm ( 1.38 in ) thick external mantlet .
D ; this variant , of which 248 vehicles were produced , reintroduced the hull machine gun and changed the turret 's internal gun mantlet to a 35 mm ( 1.38 in ) thick external mantlet .