Stella Self-Propelled Anti-Aircraft Weapon

ZVU 40 Mk I
Initial production variant, missiles had 8 km range, had no cannons, was mounted on the Foulkon Armored Fighting Vehicle chassis

ZVU 40 Mk II (1994)
Upgraded radar suite, began using Kastellax tank chassis, transport loader variant, and repair and maintenance vehicles (ZVL 40 and ZVR 40), addition of 20 mm cannons, mssiles had 10 km range

ZVU 40 Mk III (2004)
Improved fire control system and radar suite, missile range increased to 20 km

ZVU Mk IV (2019)
Further improved fire control system, updated radar suite, upgraded to 35mm cannons, detection range of 40km, tracking range of 33 km missile range of 32 km

2K51 Stella (2004)
Pojački version of the ZVU 40 Mk III equipped with the 5M643 Žaoka missile and 2x each equipped with 2,080 rounds (4,160 total).

2K51M Stella (2019)
Pojački version of the ZVU 40 Mk IV equipped with the 5M643M/5M644 Žaoka missiles and the same cannon armament of the 2K51.