This is one of the best air locker system for the Lada Niva.
22 teeth that can be used on the rear axle all Lada Niva and front Axle Lada Niva up to 2003 Year.
To insall this Air locker you will need a set with a compressor, like THIS one (Modell: CKSA 12 ARB)
How to install the air locker - https://youtu.be/sOclaTDZ190