The 100mm gun of the T-55/Type 59 was replaced with an Iranian-produced derivative of the
105mm M68 gun, capable of firing
9M117 Bastion anti-tank guided missiles as well as NATO standard ammunition. The Slovenian Fotona Electronic Fire Control System (EFCS-3-55) was added, with automatic and manual
gun stabilizers, a
laser rangefinder,
second-generation night sights, a ballistic computer, and an independent viewer and target designation system for the commander.
Explosive reactive armor (ERA) developed by the Shahid Kolah Dooz Industrial Complex can be fitted to the Type 72Z, providing protection against projectiles and napalm-type weapons. Side track skirts similar to those on the Type 59 were added to T-54/T-55 tanks upgraded with ERA. The engine was replaced with a Ukrainian 780 hp V46-6 diesel engine, together with the SPAT-1200 transmission system. Air conditioning, power steering and a fire suppression system are also believed to have been installed. ==Variants==